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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 47,665 $ 57,126
Recorded Investment with Allowance 35,709 47,667
Related Allowance 5,797 3,268
Average Recorded Investment 35,105 50,521
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 894 507
Recorded Investment with Allowance 806 383
Related Allowance 101 14
Average Recorded Investment 825 446
Real Estate [Member] | Non-residential Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 7,742 21,068
Recorded Investment with Allowance 5,688 19,052
Related Allowance 574 357
Average Recorded Investment 5,854 19,655
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 1,878 1,401
Recorded Investment with Allowance 1,683 1,209
Related Allowance 124 81
Average Recorded Investment 1,612 1,125
Real Estate [Member] | Residential Real Estate All Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 5,871 2,498
Recorded Investment with Allowance 5,614 2,235
Related Allowance 1,538 242
Average Recorded Investment 5,445 1,958
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 12,015 13,897
Recorded Investment with Allowance 6,272 10,312
Related Allowance 1,457 2,062
Average Recorded Investment 6,478 11,786
Consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 686 738
Recorded Investment with Allowance 650 715
Related Allowance 133 181
Average Recorded Investment 788 652
Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 9,799 10,722
Recorded Investment with Allowance 8,415 9,513
Related Allowance 1,870 331
Average Recorded Investment 8,062 10,335
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 8,780 6,295
Recorded Investment with Allowance 6,581 4,248
Average Recorded Investment $ 6,041 $ 4,564