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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 46,271 $ 57,126
Recorded Investment with Allowance 34,926 47,667
Related Allowance 4,766 3,268
Average Recorded Investment 33,169 50,521
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 546 507
Recorded Investment with Allowance 457 383
Related Allowance 14 14
Average Recorded Investment 484 446
Real Estate [Member] | Non-residential Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 6,420 21,068
Recorded Investment with Allowance 4,387 19,052
Related Allowance 164 357
Average Recorded Investment 4,368 19,655
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 1,078 1,401
Recorded Investment with Allowance 878 1,209
Related Allowance 79 81
Average Recorded Investment 1,131 1,125
Real Estate [Member] | Residential Real Estate All Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 7,063 2,498
Recorded Investment with Allowance 6,800 2,235
Related Allowance 1,517 242
Average Recorded Investment 5,725 1,958
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 13,862 13,897
Recorded Investment with Allowance 8,948 10,312
Related Allowance 1,900 2,062
Average Recorded Investment 7,930 11,786
Consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 877 738
Recorded Investment with Allowance 843 715
Related Allowance 168 181
Average Recorded Investment 707 652
Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 10,896 10,722
Recorded Investment with Allowance 9,029 9,513
Related Allowance 924 331
Average Recorded Investment 8,930 10,335
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 5,529 6,295
Recorded Investment with Allowance 3,584 4,248
Average Recorded Investment $ 3,894 $ 4,564