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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, 2015 | Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | $ 57,072 | $ 42,843
Recorded Investment with Allowance | 48,411 | 36,357
Related Allowance | 3,852 | 2,560
Average Recorded Investment | 51,317 | 37,132
Non-residential Real Estate Owner Occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 495 | 521
Recorded Investment with Allowance | 410 | 448
Related Allowance | 15 | 15
Average Recorded Investment | 374 | 453
Non-residential Real Estate Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 22,982 | 23,154
Recorded Investment with Allowance | 19,906 | 21,164
Related Allowance | 758 | 1,364
Average Recorded Investment | 19,969 | 21,522
Residential Real Estate Permanent Mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 1,676 | 1,095
Recorded Investment with Allowance | 1,456 | 880
Related Allowance | 68 | 85
Average Recorded Investment | 1,126 | 1,042
Residential Real Estate All Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 2,047 | 2,480
Recorded Investment with Allowance | 1,806 | 2,270
Related Allowance | 177 | 299
Average Recorded Investment | 1,892 | 2,273
Non-consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 15,940 | 1,895
Recorded Investment with Allowance | 13,481 | 1,580
Related Allowance | 2,555 | 431
Average Recorded Investment | 16,393 | 1,646
Consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 657 | 664
Recorded Investment with Allowance | 636 | 648
Related Allowance | 122 | 138
Average Recorded Investment | 596 | 602
Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 5,902 | 2,101
Recorded Investment with Allowance | 5,826 | 1,659
Related Allowance | 157 | 228
Average Recorded Investment | 5,882 | 1,512
Acquired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 7,373 | 10,933
Recorded Investment with Allowance | 4,890 | 7,708
Average Recorded Investment | $ 5,085 | $ 8,082

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