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Loans and Allowance for Loan Losses - Activity in All by Class of Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of period $ 41,557 $ 39,924 $ 40,889 $ 39,034
Charge- offs (266) (681) (1,028) (1,155)
Recoveries 59 925 155 1,071
Net charge- offs (207) 244 (873) (84)
Provisions charged to operations 1,271 3,129 2,605 4,347
Balance at end of period 42,621 43,297 42,621 43,297
Non-residential Real Estate Owner Occupied [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of period 4,461 5,012 4,406 4,827
Charge- offs   (18) (1) (22)
Recoveries   34 1 65
Net charge- offs   16   43
Provisions charged to operations 42 213 97 371
Balance at end of period 4,503 5,241 4,503 5,241
Non-residential Real Estate Other [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of period 9,898 10,685 9,616 11,026
Recoveries 1   1 3
Net charge- offs 1   1 3
Provisions charged to operations (19) 553 263 209
Balance at end of period 9,880 11,238 9,880 11,238
Residential Real Estate Permanent Mortgage [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of period 2,984 3,237 2,948 2,825
Charge- offs (56) (32) (96) (162)
Recoveries 5 31 14 41
Net charge- offs (51) (1) (82) (121)
Provisions charged to operations 177 74 244 606
Balance at end of period 3,110 3,310 3,110 3,310
Residential Real Estate All Other [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of period 6,578 6,485 6,269 6,708
Charge- offs (7) (44) (75) (93)
Recoveries 4 10 9 14
Net charge- offs (3) (34) (66) (79)
Provisions charged to operations (90) 364 282 186
Balance at end of period 6,485 6,815 6,485 6,815
Non-consumer Non-real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of period 13,068 9,703 12,771 8,977
Charge- offs (16) (61) (169) (131)
Recoveries 7 16 38 30
Net charge- offs (9) (45) (131) (101)
Provisions charged to operations 654 2,309 1,073 3,091
Balance at end of period 13,713 11,967 13,713 11,967
Consumer Non-real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of period 2,327 2,573 2,404 2,556
Charge- offs (103) (190) (230) (331)
Recoveries 40 46 55 108
Net charge- offs (63) (144) (175) (223)
Provisions charged to operations 235 216 270 312
Balance at end of period 2,499 2,645 2,499 2,645
Other Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of period 2,241 2,072 2,359 1,991
Charge- offs (50) (188) (263) (251)
Recoveries   110 9 127
Net charge- offs (50) (78) (254) (124)
Provisions charged to operations 240 (1) 326 126
Balance at end of period 2,431 1,993 2,431 1,993
Acquired Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Balance at beginning of period   157 116 124
Charge- offs (34) (148) (194) (165)
Recoveries 2 678 28 683
Net charge- offs (32) 530 (166) 518
Provisions charged to operations $ 32 (599) $ 50 (554)
Balance at end of period   $ 88   $ 88