Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Estimated Fair Values of Financial Instruments (Detail)

v3.5.0.2
Fair Value Measurements - Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Financial assets:    
Cash and due from banks $ 156,632 $ 164,364
Securities available for sale 636,275 698,296
Accrued interest receivable 10,552 9,501
FRB stock 14,423 14,098
Financial liabilities:    
Noninterest-bearing deposits 1,189,528 1,155,518
Interest-bearing deposits 2,399,761 2,354,458
Accrued interest payable 3,107 3,177
Carrying Amount [Member]    
Financial assets:    
Cash and due from banks 156,632 164,364
Securities available for sale 636,275 698,296
Loans receivable, net of allowance for loan losses 3,409,603 3,140,381
Loans held for sale 12,833 2,874
Accrued interest receivable 10,552 9,501
FHLB stock 16,385 16,385
FRB stock 14,423 14,098
Financial liabilities:    
Noninterest-bearing deposits 1,189,528 1,155,518
Interest-bearing deposits 2,399,761 2,354,458
Borrowings 298,821 188,703
Accrued interest payable 3,107 3,177
Off-balance sheet items:    
Commitments to extend credit 272,884 262,680
Letters of credit   6,839
Carrying Amount [Member] | Standby letters of credit [Member]    
Off-balance sheet items:    
Letters of credit 7,658  
Carrying Amount [Member] | Commercial letters of credit [Member]    
Off-balance sheet items:    
Letters of credit 5,524 4,018
Fair Value, Inputs, Level 1 [Member] | Fair Value [Member]    
Financial assets:    
Cash and due from banks 156,632 164,364
Securities available for sale 23,371 22,913
Loans receivable, net of allowance for loan losses 0 0
Loans held for sale 0 0
Accrued interest receivable 10,552 9,501
FHLB stock 0 0
FRB stock 0 0
Financial liabilities:    
Noninterest-bearing deposits 0 0
Interest-bearing deposits 0 0
Borrowings 0 0
Accrued interest payable 3,107 3,177
Off-balance sheet items:    
Commitments to extend credit 0 0
Letters of credit   0
Fair Value, Inputs, Level 1 [Member] | Fair Value [Member] | Standby letters of credit [Member]    
Off-balance sheet items:    
Letters of credit 0  
Fair Value, Inputs, Level 1 [Member] | Fair Value [Member] | Commercial letters of credit [Member]    
Off-balance sheet items:    
Letters of credit 0 0
Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]    
Financial assets:    
Cash and due from banks 0 0
Securities available for sale 612,904 675,383
Loans receivable, net of allowance for loan losses 0 0
Loans held for sale 12,833 2,874
Accrued interest receivable 0 0
FHLB stock 16,385 16,385
FRB stock 14,423 14,098
Financial liabilities:    
Noninterest-bearing deposits 1,189,528 1,155,518
Interest-bearing deposits 0 0
Borrowings 0 0
Accrued interest payable 0 0
Off-balance sheet items:    
Commitments to extend credit 0 0
Letters of credit   0
Fair Value, Inputs, Level 2 [Member] | Fair Value [Member] | Standby letters of credit [Member]    
Off-balance sheet items:    
Letters of credit 0  
Fair Value, Inputs, Level 2 [Member] | Fair Value [Member] | Commercial letters of credit [Member]    
Off-balance sheet items:    
Letters of credit 0 0
Fair Value, Inputs, Level 3 [Member] | Fair Value [Member]    
Financial assets:    
Cash and due from banks 0 0
Securities available for sale 0 0
Loans receivable, net of allowance for loan losses 3,408,864 3,127,172
Loans held for sale 0 0
Accrued interest receivable 0 0
FHLB stock 0 0
FRB stock 0 0
Financial liabilities:    
Noninterest-bearing deposits 0 0
Interest-bearing deposits 2,445,442 2,329,335
Borrowings 298,821 188,703
Accrued interest payable 0 0
Off-balance sheet items:    
Commitments to extend credit 272,884 262,680
Letters of credit   6,839
Fair Value, Inputs, Level 3 [Member] | Fair Value [Member] | Standby letters of credit [Member]    
Off-balance sheet items:    
Letters of credit 7,658  
Fair Value, Inputs, Level 3 [Member] | Fair Value [Member] | Commercial letters of credit [Member]    
Off-balance sheet items:    
Letters of credit $ 5,524 $ 4,018