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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, 2016 | Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | $ 43,816 | $ 57,126
Recorded Investment with Allowance | 32,889 | 47,667
Related Allowance | 4,236 | 3,268
Average Recorded Investment | 43,402 | 50,521
Non-residential Real Estate Owner Occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 615 | 507
Recorded Investment with Allowance | 487 | 383
Related Allowance | 15 | 14
Average Recorded Investment | 418 | 446
Non-residential Real Estate Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 6,207 | 21,068
Recorded Investment with Allowance | 4,190 | 19,052
Related Allowance | 157 | 357
Average Recorded Investment | 15,123 | 19,655
Residential Real Estate Permanent Mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 1,498 | 1,401
Recorded Investment with Allowance | 1,305 | 1,209
Related Allowance | 86 | 81
Average Recorded Investment | 1,276 | 1,125
Residential Real Estate All Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 5,101 | 2,498
Recorded Investment with Allowance | 4,823 | 2,235
Related Allowance | 1,382 | 242
Average Recorded Investment | 2,781 | 1,958
Non-consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 12,762 | 13,897
Recorded Investment with Allowance | 8,375 | 10,312
Related Allowance | 2,017 | 2,062
Average Recorded Investment | 9,190 | 11,786
Consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 652 | 738
Recorded Investment with Allowance | 609 | 715
Related Allowance | 120 | 181
Average Recorded Investment | 745 | 652
Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 10,705 | 10,722
Recorded Investment with Allowance | 9,355 | 9,513
Related Allowance | 459 | 331
Average Recorded Investment | 9,892 | 10,335
Acquired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 6,276 | 6,295
Recorded Investment with Allowance | 3,745 | 4,248
Average Recorded Investment | $ 3,977 | $ 4,564

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5258-111524 + Details
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