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Loans and Allowance for Loan Losses - Activity in Alll by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance $ 38,982 $ 37,436 $ 38,725 $ 37,656
Charge-offs (330) (500) (1,210) (1,563)
Recoveries 219 89 540 511
Net charge-offs (111) (411) (670) (1,052)
Provisions charged to operations (12) 233 804 654
Ending Balance 38,859 37,258 38,859 37,258
Non-residential real estate owner occupied [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 4,714 5,783 5,104 5,300
Charge-offs (1) (30) (3) (87)
Recoveries   2 16 2
Net charge-offs (1) (28) 13 (85)
Provisions charged to operations 144 (469) (260) 71
Ending Balance 4,857 5,286 4,857 5,286
Non-residential real estate other [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 10,866 8,566 9,865 8,648
Charge-offs     (19) (71)
Recoveries 2 15 12 46
Net charge-offs 2 15 (7) (25)
Provisions charged to operations 404 16 1,414 (26)
Ending Balance 11,272 8,597 11,272 8,597
Residential real estate permanent mortgage [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 2,733 3,002 2,781 2,734
Charge-offs (30) (50) (126) (119)
Recoveries 12 4 27 84
Net charge-offs (18) (46) (99) (35)
Provisions charged to operations 7 (258) 40 (1)
Ending Balance 2,722 2,698 2,722 2,698
Residential real estate all other [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 7,349 7,004 7,034 7,030
Charge-offs (23) (107) (177) (169)
Recoveries 3 5 30 34
Net charge-offs (20) (102) (147) (135)
Provisions charged to operations (722) 121 (280) 128
Ending Balance 6,607 7,023 6,607 7,023
Non-consumer non-real estate [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 8,751 8,558 9,385 9,156
Charge-offs (34) (119) (139) (449)
Recoveries 110 19 159 144
Net charge-offs 76 (100) 20 (305)
Provisions charged to operations 36 712 (542) 319
Ending Balance 8,863 9,170 8,863 9,170
Consumer non-real estate [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 2,389 2,282 2,451 2,315
Charge-offs (163) (117) (458) (308)
Recoveries 65 42 202 157
Net charge-offs (98) (75) (256) (151)
Provisions charged to operations 207 162 303 205
Ending Balance 2,498 2,369 2,498 2,369
Other loans [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 1,961 1,854 1,885 1,886
Charge-offs (76) (24) (235) (231)
Recoveries 24 2 55 33
Net charge-offs (52) (22) (180) (198)
Provisions charged to operations 36 6 240 150
Ending Balance 1,945 1,838 1,945 1,838
Acquired loans [Member]
        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning Balance 219 387 220 587
Charge-offs (3) (53) (53) (129)
Recoveries 3   39 11
Net charge-offs   (53) (14) (118)
Provisions charged to operations (124) (57) (111) (192)
Ending Balance $ 95 $ 277 $ 95 $ 277