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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | $ 38,279 | $ 47,665
Recorded Investment with Allowance | 28,072 | 35,709
Related Allowance | 4,463 | 5,797
Average Recorded Investment | 31,437 | 35,105
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 1,766 | 894
Recorded Investment with Allowance | 1,672 | 806
Related Allowance | 73 | 101
Average Recorded Investment | 1,026 | 825
Real Estate [Member] | Non-residential Real Estate Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 2,175 | 7,742
Recorded Investment with Allowance | 2,087 | 5,688
Related Allowance | 448 | 574
Average Recorded Investment | 4,809 | 5,854
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 1,884 | 1,878
Recorded Investment with Allowance | 1,682 | 1,683
Related Allowance | 129 | 124
Average Recorded Investment | 1,808 | 1,612
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 5,364 | 5,871
Recorded Investment with Allowance | 5,123 | 5,614
Related Allowance | 1,513 | 1,538
Average Recorded Investment | 5,388 | 5,445
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 11,474 | 12,015
Recorded Investment with Allowance | 5,461 | 6,272
Related Allowance | 1,486 | 1,457
Average Recorded Investment | 5,882 | 6,478
Consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 814 | 686
Recorded Investment with Allowance | 777 | 650
Related Allowance | 141 | 133
Average Recorded Investment | 776 | 788
Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 6,606 | 9,799
Recorded Investment with Allowance | 5,084 | 8,415
Related Allowance | 673 | 1,870
Average Recorded Investment | 5,276 | 8,062
Acquired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 8,196 | 8,780
Recorded Investment with Allowance | 6,186 | 6,581
Average Recorded Investment | $ 6,472 | $ 6,041

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