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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, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance $ 57,126 $ 42,843
Recorded Investment with Allowance 47,667 36,357
Related Allowance 3,268 2,560
Average Recorded Investment 50,521 37,132
Non-residential Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 507 521
Recorded Investment with Allowance 383 448
Related Allowance 14 15
Average Recorded Investment 446 453
Non-residential Real Estate Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 21,068 23,154
Recorded Investment with Allowance 19,052 21,164
Related Allowance 357 1,364
Average Recorded Investment 19,655 21,522
Residential Real Estate Permanent Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 1,401 1,095
Recorded Investment with Allowance 1,209 880
Related Allowance 81 85
Average Recorded Investment 1,125 1,042
Residential Real Estate All Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 2,498 2,480
Recorded Investment with Allowance 2,235 2,270
Related Allowance 242 299
Average Recorded Investment 1,958 2,273
Non-consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 13,897 1,895
Recorded Investment with Allowance 10,312 1,580
Related Allowance 2,062 431
Average Recorded Investment 11,786 1,646
Consumer Non-real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 738 664
Recorded Investment with Allowance 715 648
Related Allowance 181 138
Average Recorded Investment 652 602
Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 10,722 2,101
Recorded Investment with Allowance 9,513 1,659
Related Allowance 331 228
Average Recorded Investment 10,335 1,512
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid Principal Balance 6,295 10,933
Recorded Investment with Allowance 4,248 7,708
Average Recorded Investment $ 4,564 $ 8,082