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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

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