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Allowance for Loan Losses, by Loan Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | $ 20,233 | $ 20,227 |
(Recovery of) provision for loan losses | 1,254 | 2,162 |
Benefit attributable to the FDIC indemnification asset | 1 | 29 |
(Recovery of) provision for loan losses charged to operations | 1,255 | 2,191 | $ 145
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset | (1) | (29) |
Charge-offs | (5,176) | (3,745) |
Recoveries | 1,637 | 1,589 |
Net charge-offs | (3,539) | (2,156) |
Ending balance | 17,948 | 20,233 | 20,227
Commercial Loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 13,133 | 13,047 |
(Recovery of) provision for loan losses | 30 | 894 |
Benefit attributable to the FDIC indemnification asset |  | 29 |
(Recovery of) provision for loan losses charged to operations | 30 | 923 |
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset |  | (29) |
Charge-offs | (2,392) | (1,282) |
Recoveries | 919 | 474 |
Net charge-offs | (1,473) | (808) |
Ending balance | 11,690 | 13,133 | 13,047
Consumer Real Estate |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 6,410 | 6,510 |
(Recovery of) provision for loan losses | 343 | 128 |
Benefit attributable to the FDIC indemnification asset | 1 |  |
(Recovery of) provision for loan losses charged to operations | 344 | 128 |
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset | (1) |  |
Charge-offs | (1,612) | (906) |
Recoveries | 358 | 678 |
Net charge-offs | (1,254) | (228) |
Ending balance | 5,499 | 6,410 | 6,510
Consumer and Other |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 690 | 670 |
(Recovery of) provision for loan losses | 881 | 1,140 |
(Recovery of) provision for loan losses charged to operations | 881 | 1,140 |
Charge-offs | (1,172) | (1,557) |
Recoveries | 360 | 437 |
Net charge-offs | (812) | (1,120) |
Ending balance | 759 | 690 | 670
Allowance Excluding Purchased Credit Impaired |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 20,179 | 20,169 |
(Recovery of) provision for loan losses | 1,296 | 2,166 |
Charge-offs | (5,176) | (3,745) |
Recoveries | 1,637 | 1,589 |
Net charge-offs | (3,539) | (2,156) |
Ending balance | 17,936 | 20,179 | 20,169
Allowance Excluding Purchased Credit Impaired | Commercial Loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 13,133 | 13,010 |
(Recovery of) provision for loan losses | 30 | 931 |
Charge-offs | (2,392) | (1,282) |
Recoveries | 919 | 474 |
Net charge-offs | (1,473) | (808) |
Ending balance | 11,690 | 13,133 | 13,010
Allowance Excluding Purchased Credit Impaired | Consumer Real Estate |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 6,356 | 6,489 |
(Recovery of) provision for loan losses | 385 | 95 |
Charge-offs | (1,612) | (906) |
Recoveries | 358 | 678 |
Net charge-offs | (1,254) | (228) |
Ending balance | 5,487 | 6,356 | 6,489
Allowance Excluding Purchased Credit Impaired | Consumer and Other |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 690 | 670 |
(Recovery of) provision for loan losses | 881 | 1,140 |
Charge-offs | (1,172) | (1,557) |
Recoveries | 360 | 437 |
Net charge-offs | (812) | (1,120) |
Ending balance | 759 | 690 | 670
Purchased Credit Impaired |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 54 | 58 |
(Recovery of) provision for loan losses | (42) | (4) |
Benefit attributable to the FDIC indemnification asset | 1 | 29 |
(Recovery of) provision for loan losses charged to operations | (41) | 25 |
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset | (1) | (29) |
Ending balance | 12 | 54 | 58
Purchased Credit Impaired | Commercial Loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance |  | 37 |
(Recovery of) provision for loan losses |  | (37) |
Benefit attributable to the FDIC indemnification asset |  | 29 |
(Recovery of) provision for loan losses charged to operations |  | (8) |
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset |  | (29) |
Ending balance |  |  | 37
Purchased Credit Impaired | Consumer Real Estate |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Beginning balance | 54 | 21 |
(Recovery of) provision for loan losses | (42) | 33 |
Benefit attributable to the FDIC indemnification asset | 1 |  |
(Recovery of) provision for loan losses charged to operations | (41) | 33 |
(Recovery of) provision for loan losses recorded through the FDIC indemnification asset | (1) |  |
Ending balance | $ 12 | $ 54 | $ 21

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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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