|
Investment Securities - Available for Sale Securities, Continuous Unrealized Loss Position, Fair value (Detail) (USD $)
In Thousands, unless otherwise specified
|
Dec. 31, 2013
Security
|
Dec. 31, 2012
Security
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-Sale Within One Year, Gross Unrealized Loss |
$ 10,607
|
$ 638
|
| Available-for-Sale Within One Year, Estimated Fair Value |
366,638
|
85,291
|
| Available-for-Sale Within One Year, Number of Securities |
124
|
33
|
| Available-for-Sale More than One Year, Gross Unrealized Loss |
8,362
|
301
|
| Available-for-Sale More than One Year, Estimated Fair Value |
107,384
|
13,655
|
| Available-for-Sale More than One Year, Number of Securities |
45
|
7
|
| Available-for-Sale, Gross Unrealized Loss |
18,969
|
939
|
| Available-for-Sale, Estimated Fair Value |
474,022
|
98,946
|
| Available-for-Sale, Number of Securities |
169
|
40
|
|
Collateralized mortgage obligations [Member]
|
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-Sale Within One Year, Gross Unrealized Loss |
2,353
|
109
|
| Available-for-Sale Within One Year, Estimated Fair Value |
87,026
|
14,344
|
| Available-for-Sale Within One Year, Number of Securities |
27
|
5
|
| Available-for-Sale More than One Year, Gross Unrealized Loss |
864
|
|
| Available-for-Sale More than One Year, Estimated Fair Value |
14,657
|
|
| Available-for-Sale More than One Year, Number of Securities |
7
|
|
| Available-for-Sale, Gross Unrealized Loss |
3,217
|
109
|
| Available-for-Sale, Estimated Fair Value |
101,683
|
14,344
|
| Available-for-Sale, Number of Securities |
34
|
5
|
|
Municipal bonds-tax exempt [Member]
|
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-Sale Within One Year, Gross Unrealized Loss |
30
|
|
| Available-for-Sale Within One Year, Estimated Fair Value |
8,562
|
|
| Available-for-Sale Within One Year, Number of Securities |
5
|
|
| Available-for-Sale More than One Year, Gross Unrealized Loss |
|
|
| Available-for-Sale More than One Year, Estimated Fair Value |
|
|
| Available-for-Sale More than One Year, Number of Securities |
|
|
| Available-for-Sale, Gross Unrealized Loss |
30
|
|
| Available-for-Sale, Estimated Fair Value |
8,562
|
|
| Available-for-Sale, Number of Securities |
5
|
|
|
Municipal bonds-taxable [Member]
|
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-Sale Within One Year, Gross Unrealized Loss |
787
|
126
|
| Available-for-Sale Within One Year, Estimated Fair Value |
22,817
|
4,587
|
| Available-for-Sale Within One Year, Number of Securities |
16
|
4
|
| Available-for-Sale More than One Year, Gross Unrealized Loss |
293
|
9
|
| Available-for-Sale More than One Year, Estimated Fair Value |
3,813
|
1,964
|
| Available-for-Sale More than One Year, Number of Securities |
4
|
3
|
| Available-for-Sale, Gross Unrealized Loss |
1,080
|
135
|
| Available-for-Sale, Estimated Fair Value |
26,630
|
6,551
|
| Available-for-Sale, Number of Securities |
20
|
7
|
|
U.S. treasury bills [Member]
|
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-Sale Within One Year, Gross Unrealized Loss |
1
|
|
| Available-for-Sale Within One Year, Estimated Fair Value |
19,996
|
|
| Available-for-Sale Within One Year, Number of Securities |
2
|
|
| Available-for-Sale More than One Year, Gross Unrealized Loss |
|
|
| Available-for-Sale More than One Year, Estimated Fair Value |
|
|
| Available-for-Sale More than One Year, Number of Securities |
|
|
| Available-for-Sale, Gross Unrealized Loss |
1
|
|
| Available-for-Sale, Estimated Fair Value |
19,996
|
|
| Available-for-Sale, Number of Securities |
2
|
|
|
Mortgage-backed securities [Member]
|
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-Sale Within One Year, Gross Unrealized Loss |
3,437
|
186
|
| Available-for-Sale Within One Year, Estimated Fair Value |
170,324
|
28,354
|
| Available-for-Sale Within One Year, Number of Securities |
51
|
10
|
| Available-for-Sale More than One Year, Gross Unrealized Loss |
2,589
|
|
| Available-for-Sale More than One Year, Estimated Fair Value |
30,947
|
|
| Available-for-Sale More than One Year, Number of Securities |
12
|
|
| Available-for-Sale, Gross Unrealized Loss |
6,026
|
186
|
| Available-for-Sale, Estimated Fair Value |
201,271
|
28,354
|
| Available-for-Sale, Number of Securities |
63
|
10
|
|
U.S. government agency securities [Member]
|
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-Sale Within One Year, Gross Unrealized Loss |
3,942
|
94
|
| Available-for-Sale Within One Year, Estimated Fair Value |
50,932
|
26,894
|
| Available-for-Sale Within One Year, Number of Securities |
19
|
9
|
| Available-for-Sale More than One Year, Gross Unrealized Loss |
3,374
|
|
| Available-for-Sale More than One Year, Estimated Fair Value |
32,606
|
|
| Available-for-Sale More than One Year, Number of Securities |
12
|
|
| Available-for-Sale, Gross Unrealized Loss |
7,316
|
94
|
| Available-for-Sale, Estimated Fair Value |
83,538
|
26,894
|
| Available-for-Sale, Number of Securities |
31
|
9
|
|
Corporate bonds [Member]
|
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-Sale Within One Year, Gross Unrealized Loss |
9
|
|
| Available-for-Sale Within One Year, Estimated Fair Value |
5,024
|
|
| Available-for-Sale Within One Year, Number of Securities |
1
|
|
| Available-for-Sale More than One Year, Gross Unrealized Loss |
177
|
246
|
| Available-for-Sale More than One Year, Estimated Fair Value |
11,803
|
10,738
|
| Available-for-Sale More than One Year, Number of Securities |
3
|
3
|
| Available-for-Sale, Gross Unrealized Loss |
186
|
246
|
| Available-for-Sale, Estimated Fair Value |
16,827
|
10,738
|
| Available-for-Sale, Number of Securities |
4
|
3
|
|
SBA loan pool securities [Member]
|
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-Sale Within One Year, Gross Unrealized Loss |
|
82
|
| Available-for-Sale Within One Year, Estimated Fair Value |
|
11,004
|
| Available-for-Sale Within One Year, Number of Securities |
|
3
|
| Available-for-Sale More than One Year, Gross Unrealized Loss |
969
|
|
| Available-for-Sale More than One Year, Estimated Fair Value |
12,629
|
|
| Available-for-Sale More than One Year, Number of Securities |
4
|
|
| Available-for-Sale, Gross Unrealized Loss |
969
|
82
|
| Available-for-Sale, Estimated Fair Value |
12,629
|
11,004
|
| Available-for-Sale, Number of Securities |
4
|
3
|
|
Other securities [Member]
|
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-Sale Within One Year, Gross Unrealized Loss |
48
|
1
|
| Available-for-Sale Within One Year, Estimated Fair Value |
1,957
|
12
|
| Available-for-Sale Within One Year, Number of Securities |
3
|
1
|
| Available-for-Sale More than One Year, Gross Unrealized Loss |
96
|
46
|
| Available-for-Sale More than One Year, Estimated Fair Value |
929
|
953
|
| Available-for-Sale More than One Year, Number of Securities |
3
|
1
|
| Available-for-Sale, Gross Unrealized Loss |
144
|
47
|
| Available-for-Sale, Estimated Fair Value |
2,886
|
965
|
| Available-for-Sale, Number of Securities |
6
|
2
|
|
Equity securities [Member]
|
|
|
| Summary of Investment Holdings [Line Items] |
|
|
| Available-for-Sale Within One Year, Gross Unrealized Loss |
|
40
|
| Available-for-Sale Within One Year, Estimated Fair Value |
|
96
|
| Available-for-Sale Within One Year, Number of Securities |
|
1
|
| Available-for-Sale, Gross Unrealized Loss |
|
40
|
| Available-for-Sale, Estimated Fair Value |
|
$ 96
|
| Available-for-Sale, Number of Securities |
|
1
|