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Loans and Allowance for Loan Losses - Activity in ALL by Class of Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period $ 49,005 $ 46,566 $ 48,693 $ 41,666
Charge- offs (1,138) (1,560) (3,898) (3,769)
Recoveries 112 115 1,271 317
Net charge- offs (1,026) (1,445) (2,627) (3,452)
Provisions charged to operations 3,276 2,940 5,189 9,847
Balance at end of period 51,255 48,061 51,255 48,061
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 5,685 4,896 5,602 4,661
Charge- offs (2) (1) (74) (11)
Recoveries 1   5  
Net charge- offs (1) (1) (69) (11)
Provisions charged to operations 261 214 412 459
Balance at end of period 5,945 5,109 5,945 5,109
Real Estate [Member] | Non-residential Real Estate Other [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 10,480 10,302 10,793 9,921
Charge- offs   (5) (26) (9)
Recoveries 1 1 3 3
Net charge- offs 1 (4) (23) (6)
Provisions charged to operations 70 285 (219) 668
Balance at end of period 10,551 10,583 10,551 10,583
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 3,148 3,203 3,129 3,148
Charge- offs (90) (58) (246) (157)
Recoveries 9 10 20 48
Net charge- offs (81) (48) (226) (109)
Provisions charged to operations 91 52 255 168
Balance at end of period 3,158 3,207 3,158 3,207
Real Estate [Member] | Residential Real Estate All Other [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 8,912 8,293 8,622 6,725
Charge- offs (89) (10) (162) (147)
Recoveries 13 8 30 19
Net charge- offs (76) (2) (132) (128)
Provisions charged to operations 503 212 849 1,906
Balance at end of period 9,339 8,503 9,339 8,503
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 13,643 13,441 12,421 11,754
Charge- offs (538) (1,053) (1,215) (2,358)
Recoveries 24 31 986 77
Net charge- offs (514) (1,022) (229) (2,281)
Provisions charged to operations 1,838 (385) 2,775 2,561
Balance at end of period 14,967 12,034 14,967 12,034
Consumer Non-real Estate [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 2,706 2,749 2,804 2,642
Charge- offs (238) (374) (706) (729)
Recoveries 57 61 140 137
Net charge- offs (181) (313) (566) (592)
Provisions charged to operations 207 443 494 829
Balance at end of period 2,732 2,879 2,732 2,879
Other Loans [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 3,006 3,377 4,045 2,648
Charge- offs (47) (18) (1,321) (300)
Recoveries   2 22 15
Net charge- offs (47) (16) (1,299) (285)
Provisions charged to operations 153 812 366 1,810
Balance at end of period 3,112 4,173 3,112 4,173
Acquired Loans [Member]        
Financing Receivable Allowance For Credit Losses [Line Items]        
Balance at beginning of period 1,425 305 1,277 167
Charge- offs (134) (41) (148) (58)
Recoveries 7 2 65 18
Net charge- offs (127) (39) (83) (40)
Provisions charged to operations 153 1,307 257 1,446
Balance at end of period $ 1,451 $ 1,573 $ 1,451 $ 1,573