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Loans and Allowance for Loan Losses - Activity in All by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of period $ 39,034 $ 38,725
Charge- offs (474) (533)
Recoveries 146 172
Net charge- offs (328) (361)
Provisions charged to operations 1,218 300
Balance at end of period 39,924 38,664
Non-residential real estate owner occupied [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of period 4,827 5,104
Charge- offs (4)  
Recoveries 31 15
Net charge- offs 27 15
Provisions charged to operations 158 (253)
Balance at end of period 5,012 4,866
Non-residential real estate other [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of period 11,026 9,865
Charge- offs   (18)
Recoveries 3 4
Net charge- offs 3 (14)
Provisions charged to operations (344) 614
Balance at end of period 10,685 10,465
Residential real estate permanent mortgage [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of period 2,825 2,781
Charge- offs (130) (56)
Recoveries 10 11
Net charge- offs (120) (45)
Provisions charged to operations 532 20
Balance at end of period 3,237 2,756
Residential real estate all other [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of period 6,708 7,034
Charge- offs (49) (95)
Recoveries 4 2
Net charge- offs (45) (93)
Provisions charged to operations (178) 224
Balance at end of period 6,485 7,165
Non-consumer non-real estate [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of period 8,977 9,385
Charge- offs (70) (36)
Recoveries 14 31
Net charge- offs (56) (5)
Provisions charged to operations 782 (398)
Balance at end of period 9,703 8,982
Consumer non-real estate [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of period 2,556 2,451
Charge- offs (140) (140)
Recoveries 62 76
Net charge- offs (78) (64)
Provisions charged to operations 95 (3)
Balance at end of period 2,573 2,384
Other loans [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of period 1,991 1,885
Charge- offs (64) (139)
Recoveries 17  
Net charge- offs (47) (139)
Provisions charged to operations 128 76
Balance at end of period 2,072 1,822
Acquired loans [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Balance at beginning of period 124 220
Charge- offs (17) (49)
Recoveries 5 33
Net charge- offs (12) (16)
Provisions charged to operations 45 20
Balance at end of period $ 157 $ 224