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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 46,273 $ 57,126
Recorded Investment with Allowance 34,934 47,667
Related Allowance 5,475 3,268
Average Recorded Investment 34,672 50,521
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 728 507
Recorded Investment with Allowance 645 383
Related Allowance 48 14
Average Recorded Investment 531 446
Real Estate [Member] | Non-residential Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 8,049 21,068
Recorded Investment with Allowance 6,001 19,052
Related Allowance 335 357
Average Recorded Investment 5,653 19,655
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 1,545 1,401
Recorded Investment with Allowance 1,353 1,209
Related Allowance 108 81
Average Recorded Investment 1,019 1,125
Real Estate [Member] | Residential Real Estate All Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 5,704 2,498
Recorded Investment with Allowance 5,465 2,235
Related Allowance 1,428 242
Average Recorded Investment 6,007 1,958
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 11,644 13,897
Recorded Investment with Allowance 6,255 10,312
Related Allowance 1,470 2,062
Average Recorded Investment 7,347 11,786
Consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 898 738
Recorded Investment with Allowance 863 715
Related Allowance 235 181
Average Recorded Investment 909 652
Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 10,440 10,722
Recorded Investment with Allowance 9,008 9,513
Related Allowance 1,851 331
Average Recorded Investment 9,191 10,335
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 7,265 6,295
Recorded Investment with Allowance 5,344 4,248
Average Recorded Investment $ 4,015 $ 4,564