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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, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | $ 61,070 | $ 49,391
Recorded Investment with Allowance | 49,727 | 39,688
Related Allowance | 6,279 | 5,647
Average Recorded Investment | 47,638 | 35,181
Real Estate [Member] | Non-residential Real Estate Owner Occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 7,718 | 2,011
Recorded Investment with Allowance | 7,636 | 1,945
Related Allowance | 301 | 141
Average Recorded Investment | 7,387 | 1,858
Real Estate [Member] | Non-residential Real Estate Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 9,881 | 10,323
Recorded Investment with Allowance | 9,633 | 10,240
Related Allowance | 521 | 496
Average Recorded Investment | 9,730 | 3,975
Real Estate [Member] | Residential Real Estate Permanent Mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 2,252 | 1,745
Recorded Investment with Allowance | 2,047 | 1,542
Related Allowance | 155 | 146
Average Recorded Investment | 1,819 | 1,440
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 7,724 | 5,837
Recorded Investment with Allowance | 7,417 | 5,549
Related Allowance | 2,445 | 2,135
Average Recorded Investment | 6,920 | 5,258
Commercial and Financial [Member] | Non-consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 20,876 | 18,101
Recorded Investment with Allowance | 13,639 | 11,158
Related Allowance | 2,662 | 2,412
Average Recorded Investment | 13,048 | 11,131
Consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 794 | 545
Recorded Investment with Allowance | 755 | 514
Related Allowance | 136 | 127
Average Recorded Investment | 780 | 541
Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 760 | 6,092
Recorded Investment with Allowance | 525 | 5,595
Related Allowance | 55 | 178
Average Recorded Investment | 1,084 | 7,439
Acquired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Principal Balance | 11,065 | 4,737
Recorded Investment with Allowance | 8,075 | 3,145
Related Allowance | 4 | 12
Average Recorded Investment | $ 6,870 | $ 3,539

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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=84173941&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=84173941&loc=d3e5258-111524 + Details
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