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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 43,816 $ 57,126
Recorded Investment with Allowance 32,889 47,667
Related Allowance 4,236 3,268
Average Recorded Investment 43,402 50,521
Non-residential Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 615 507
Recorded Investment with Allowance 487 383
Related Allowance 15 14
Average Recorded Investment 418 446
Non-residential Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 6,207 21,068
Recorded Investment with Allowance 4,190 19,052
Related Allowance 157 357
Average Recorded Investment 15,123 19,655
Residential Real Estate Permanent Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 1,498 1,401
Recorded Investment with Allowance 1,305 1,209
Related Allowance 86 81
Average Recorded Investment 1,276 1,125
Residential Real Estate All Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 5,101 2,498
Recorded Investment with Allowance 4,823 2,235
Related Allowance 1,382 242
Average Recorded Investment 2,781 1,958
Non-consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 12,762 13,897
Recorded Investment with Allowance 8,375 10,312
Related Allowance 2,017 2,062
Average Recorded Investment 9,190 11,786
Consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 652 738
Recorded Investment with Allowance 609 715
Related Allowance 120 181
Average Recorded Investment 745 652
Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 10,705 10,722
Recorded Investment with Allowance 9,355 9,513
Related Allowance 459 331
Average Recorded Investment 9,892 10,335
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 6,276 6,295
Recorded Investment with Allowance 3,745 4,248
Average Recorded Investment $ 3,977 $ 4,564