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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | $ 56,446 | $ 42,843
Recorded Investment with Allowance | 49,823 | 36,357
Related Allowance | 6,319 | 2,560
Average Recorded Investment | 40,040 | 37,132
Non-residential Real Estate Owner Occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 467 | 521
Recorded Investment with Allowance | 386 | 448
Related Allowance | 14 | 15
Average Recorded Investment | 393 | 453
Non-residential Real Estate Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 22,354 | 23,154
Recorded Investment with Allowance | 20,184 | 21,164
Related Allowance | 1,316 | 1,364
Average Recorded Investment | 20,553 | 21,522
Residential Real Estate Permanent Mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 1,324 | 1,095
Recorded Investment with Allowance | 1,107 | 880
Related Allowance | 85 | 85
Average Recorded Investment | 941 | 1,042
Residential Real Estate All Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 2,122 | 2,480
Recorded Investment with Allowance | 1,889 | 2,270
Related Allowance | 202 | 299
Average Recorded Investment | 2,058 | 2,273
Non-consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 19,328 | 1,895
Recorded Investment with Allowance | 18,879 | 1,580
Related Allowance | 4,503 | 431
Average Recorded Investment | 6,740 | 1,646
Consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 612 | 664
Recorded Investment with Allowance | 597 | 648
Related Allowance | 119 | 138
Average Recorded Investment | 536 | 602
Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 2,056 | 2,101
Recorded Investment with Allowance | 1,628 | 1,659
Related Allowance | 80 | 228
Average Recorded Investment | 1,699 | 1,512
Acquired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 8,183 | 10,933
Recorded Investment with Allowance | 5,153 | 7,708
Average Recorded Investment | $ 7,120 | $ 8,082

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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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