Securities - Available for Sale Securities, Continuous Unrealized Loss Position, Fair value (Detail)
$ in Thousands |
12 Months Ended |
|
Dec. 31, 2015
USD ($)
Security
|
Dec. 31, 2014
USD ($)
Security
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-sale, Less Than 12 Months, Gross Unrealized Loss |
$ 2,628
|
$ 833
|
| Available-for-sale, Less Than 12 Months, Estimated Fair Value |
$ 359,531
|
$ 276,192
|
| Available-for-sale, Less Than 12 Months, Number of Securities | Security |
104
|
60
|
| Available-for-sale, 12 Months or More, Gross Unrealized Loss |
$ 2,191
|
$ 4,133
|
| Available-for-sale, 12 Months or More, Estimated Fair Value |
$ 87,120
|
$ 184,458
|
| Available-for-sale, 12 Months or More, Number of Securities | Security |
36
|
73
|
| Available-for-sale, Gross Unrealized Loss |
$ 4,819
|
$ 4,966
|
| Available-for-sale, Estimated Fair Value |
$ 446,651
|
$ 460,650
|
| Available-for-sale, Number of Securities | Security |
140
|
133
|
| Municipal bonds-tax exempt [Member] |
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-sale, Less Than 12 Months, Gross Unrealized Loss |
$ 19
|
$ 0
|
| Available-for-sale, Less Than 12 Months, Estimated Fair Value |
$ 8,922
|
$ 0
|
| Available-for-sale, Less Than 12 Months, Number of Securities | Security |
6
|
0
|
| Available-for-sale, 12 Months or More, Gross Unrealized Loss |
$ 0
|
$ 91
|
| Available-for-sale, 12 Months or More, Estimated Fair Value |
$ 0
|
$ 5,538
|
| Available-for-sale, 12 Months or More, Number of Securities | Security |
0
|
5
|
| Available-for-sale, Gross Unrealized Loss |
$ 19
|
$ 91
|
| Available-for-sale, Estimated Fair Value |
$ 8,922
|
$ 5,538
|
| Available-for-sale, Number of Securities | Security |
6
|
5
|
| Municipal bonds-taxable [Member] |
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-sale, Less Than 12 Months, Gross Unrealized Loss |
$ 88
|
|
| Available-for-sale, Less Than 12 Months, Estimated Fair Value |
$ 7,106
|
|
| Available-for-sale, Less Than 12 Months, Number of Securities | Security |
4
|
|
| Available-for-sale, 12 Months or More, Gross Unrealized Loss |
$ 0
|
|
| Available-for-sale, 12 Months or More, Estimated Fair Value |
$ 0
|
|
| Available-for-sale, 12 Months or More, Number of Securities | Security |
0
|
|
| Available-for-sale, Gross Unrealized Loss |
$ 88
|
|
| Available-for-sale, Estimated Fair Value |
$ 7,106
|
|
| Available-for-sale, Number of Securities | Security |
4
|
|
| Collateralized mortgage obligations [Member] |
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-sale, Less Than 12 Months, Gross Unrealized Loss |
$ 335
|
$ 350
|
| Available-for-sale, Less Than 12 Months, Estimated Fair Value |
$ 48,970
|
$ 78,191
|
| Available-for-sale, Less Than 12 Months, Number of Securities | Security |
18
|
21
|
| Available-for-sale, 12 Months or More, Gross Unrealized Loss |
$ 662
|
$ 724
|
| Available-for-sale, 12 Months or More, Estimated Fair Value |
$ 32,964
|
$ 33,308
|
| Available-for-sale, 12 Months or More, Number of Securities | Security |
13
|
13
|
| Available-for-sale, Gross Unrealized Loss |
$ 997
|
$ 1,074
|
| Available-for-sale, Estimated Fair Value |
$ 81,934
|
$ 111,499
|
| Available-for-sale, Number of Securities | Security |
31
|
34
|
| Mortgage-backed securities [Member] |
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-sale, Less Than 12 Months, Gross Unrealized Loss |
$ 1,734
|
$ 288
|
| Available-for-sale, Less Than 12 Months, Estimated Fair Value |
$ 193,931
|
$ 102,704
|
| Available-for-sale, Less Than 12 Months, Number of Securities | Security |
52
|
21
|
| Available-for-sale, 12 Months or More, Gross Unrealized Loss |
$ 727
|
$ 915
|
| Available-for-sale, 12 Months or More, Estimated Fair Value |
$ 21,659
|
$ 50,625
|
| Available-for-sale, 12 Months or More, Number of Securities | Security |
9
|
19
|
| Available-for-sale, Gross Unrealized Loss |
$ 2,461
|
$ 1,203
|
| Available-for-sale, Estimated Fair Value |
$ 215,590
|
$ 153,329
|
| Available-for-sale, Number of Securities | Security |
61
|
40
|
| U.S. government agency securities [Member] |
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-sale, Less Than 12 Months, Gross Unrealized Loss |
$ 201
|
$ 0
|
| Available-for-sale, Less Than 12 Months, Estimated Fair Value |
$ 23,289
|
$ 5,000
|
| Available-for-sale, Less Than 12 Months, Number of Securities | Security |
8
|
1
|
| Available-for-sale, 12 Months or More, Gross Unrealized Loss |
$ 455
|
$ 1,822
|
| Available-for-sale, 12 Months or More, Estimated Fair Value |
$ 24,533
|
$ 73,142
|
| Available-for-sale, 12 Months or More, Number of Securities | Security |
8
|
26
|
| Available-for-sale, Gross Unrealized Loss |
$ 656
|
$ 1,822
|
| Available-for-sale, Estimated Fair Value |
$ 47,822
|
$ 78,142
|
| Available-for-sale, Number of Securities | Security |
16
|
27
|
| SBA loan pool securities [Member] |
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-sale, Less Than 12 Months, Gross Unrealized Loss |
$ 161
|
$ 155
|
| Available-for-sale, Less Than 12 Months, Estimated Fair Value |
$ 50,499
|
$ 85,062
|
| Available-for-sale, Less Than 12 Months, Number of Securities | Security |
12
|
15
|
| Available-for-sale, 12 Months or More, Gross Unrealized Loss |
$ 250
|
$ 433
|
| Available-for-sale, 12 Months or More, Estimated Fair Value |
$ 7,036
|
$ 11,975
|
| Available-for-sale, 12 Months or More, Number of Securities | Security |
3
|
4
|
| Available-for-sale, Gross Unrealized Loss |
$ 411
|
$ 588
|
| Available-for-sale, Estimated Fair Value |
$ 57,535
|
$ 97,037
|
| Available-for-sale, Number of Securities | Security |
15
|
19
|
| Corporate bonds [Member] |
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-sale, Less Than 12 Months, Gross Unrealized Loss |
$ 24
|
$ 4
|
| Available-for-sale, Less Than 12 Months, Estimated Fair Value |
$ 4,994
|
$ 5,021
|
| Available-for-sale, Less Than 12 Months, Number of Securities | Security |
1
|
1
|
| Available-for-sale, 12 Months or More, Gross Unrealized Loss |
$ 0
|
$ 68
|
| Available-for-sale, 12 Months or More, Estimated Fair Value |
$ 0
|
$ 7,925
|
| Available-for-sale, 12 Months or More, Number of Securities | Security |
0
|
2
|
| Available-for-sale, Gross Unrealized Loss |
$ 24
|
$ 72
|
| Available-for-sale, Estimated Fair Value |
$ 4,994
|
$ 12,946
|
| Available-for-sale, Number of Securities | Security |
1
|
3
|
| Other securities [Member] |
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-sale, Less Than 12 Months, Gross Unrealized Loss |
$ 66
|
$ 0
|
| Available-for-sale, Less Than 12 Months, Estimated Fair Value |
$ 21,820
|
$ 0
|
| Available-for-sale, Less Than 12 Months, Number of Securities | Security |
3
|
0
|
| Available-for-sale, 12 Months or More, Gross Unrealized Loss |
$ 97
|
$ 80
|
| Available-for-sale, 12 Months or More, Estimated Fair Value |
$ 928
|
$ 1,945
|
| Available-for-sale, 12 Months or More, Number of Securities | Security |
3
|
4
|
| Available-for-sale, Gross Unrealized Loss |
$ 163
|
$ 80
|
| Available-for-sale, Estimated Fair Value |
$ 22,748
|
$ 1,945
|
| Available-for-sale, Number of Securities | Security |
6
|
4
|
| Equity securities [Member] |
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-sale, Less Than 12 Months, Gross Unrealized Loss |
|
$ 36
|
| Available-for-sale, Less Than 12 Months, Estimated Fair Value |
|
$ 214
|
| Available-for-sale, Less Than 12 Months, Number of Securities | Security |
|
1
|
| Available-for-sale, 12 Months or More, Gross Unrealized Loss |
|
$ 0
|
| Available-for-sale, 12 Months or More, Estimated Fair Value |
|
$ 0
|
| Available-for-sale, 12 Months or More, Number of Securities | Security |
|
0
|
| Available-for-sale, Gross Unrealized Loss |
|
$ 36
|
| Available-for-sale, Estimated Fair Value |
|
$ 214
|
| Available-for-sale, Number of Securities | Security |
|
1
|