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Allowance for Loan Losses (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 42,737 |  |  |  | $ 42,437 | $ 42,737 | $ 42,437 | $ 42,289 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (7,008) | (9,471) | (6,776) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 2,932 | 2,241 | 2,174 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | (4,076) | (7,230) | (4,602) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  | 6,604 | 3,913 |  |  |
Benefit attributable to FDIC loss share agreements |  |  |  |  |  |  |  |  |  | (265) | (872) |  |  |
Recoveries payable to FDIC |  |  |  |  |  |  |  |  |  | 1,191 | 1,709 |  |  |
Provision for loan losses charged to operations | $ 2,150 | $ 2,150 | $ 1,750 | 1,500 | $ 1,650 | $ 2,650 | $ 1,430 | 1,800 | 7,550 | 7,530 | 4,750 |  |  |
Ending balance | 46,211 |  |  |  | 42,737 |  |  |  | 46,211 | 42,737 | 42,437 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | $ 2,674 | $ 4,141 | $ 7,600
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 41,760 | 35,776 | 33,131
Acquired with deteriorated credit quality | 46,211 |  |  | 42,737 | 42,737 |  |  | 42,437 | 42,737 | 42,437 | 42,289 | 46,211 | 42,737 | 42,437
Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 2,820 |  |  |  | 1,706 | 2,820 | 1,706 |  |  |  |
Ending balance | 1,777 |  |  |  | 2,820 |  |  |  | 1,777 | 2,820 | 1,706 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality | 1,777 |  |  | 2,820 | 2,820 |  |  | 1,706 | 2,820 | 1,706 | 1,706 | 1,777 | 2,820 | 1,706
Commercial, financial, agricultural |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 5,486 |  |  |  | 4,186 | 5,486 | 4,186 | 3,305 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (2,874) | (2,725) | (943) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 422 | 331 | 361 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | (2,452) | (2,394) | (582) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  | 3,716 | 1,489 |  |  |
Benefit attributable to FDIC loss share agreements |  |  |  |  |  |  |  |  |  | (61) | (64) |  |  |
Recoveries payable to FDIC |  |  |  |  |  |  |  |  |  | 39 | 38 |  |  |
Provision for loan losses charged to operations |  |  |  |  |  |  |  |  | 2,508 | 3,694 | 1,463 |  |  |
Ending balance | 5,542 |  |  |  | 5,486 |  |  |  | 5,542 | 5,486 | 4,186 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 190 | 446 | 6
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 5,040 | 4,668 | 3,827
Acquired with deteriorated credit quality | 5,542 |  |  | 5,486 | 5,486 |  |  | 4,186 | 5,486 | 4,186 | 3,305 | 5,542 | 5,486 | 4,186
Commercial, financial, agricultural | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 372 |  |  |  | 353 | 372 | 353 |  |  |  |
Ending balance | 312 |  |  |  | 372 |  |  |  | 312 | 372 | 353 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality | 312 |  |  | 372 | 372 |  |  | 353 | 372 | 353 | 353 | 312 | 372 | 353
Real estate – construction |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 2,380 |  |  |  | 1,852 | 2,380 | 1,852 | 1,415 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | 0 | 0 | (26) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 105 | 47 | 26 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | 105 | 47 | 0 |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  | 364 | 435 |  |  |
Benefit attributable to FDIC loss share agreements |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |
Recoveries payable to FDIC |  |  |  |  |  |  |  |  |  | 117 | 2 |  |  |
Provision for loan losses charged to operations |  |  |  |  |  |  |  |  | 943 | 481 | 437 |  |  |
Ending balance | 3,428 |  |  |  | 2,380 |  |  |  | 3,428 | 2,380 | 1,852 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 4 | 1 | 20
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 3,424 | 2,379 | 1,832
Acquired with deteriorated credit quality | 3,428 |  |  | 2,380 | 2,380 |  |  | 1,852 | 2,380 | 1,852 | 1,415 | 3,428 | 2,380 | 1,852
Real estate – construction | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 0 |  |  |  | 0 | 0 | 0 |  |  |  |
Ending balance | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality | 0 |  |  | 0 | 0 |  |  | 0 | 0 | 0 | 0 | 0 | 0 | 0
Real estate – 1-4 family mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 14,294 |  |  |  | 13,908 | 14,294 | 13,908 | 13,549 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (1,713) | (3,906) | (2,173) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 733 | 997 | 1,064 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | (980) | (2,909) | (1,109) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  | 2,616 | 650 |  |  |
Benefit attributable to FDIC loss share agreements |  |  |  |  |  |  |  |  |  | (115) | (91) |  |  |
Recoveries payable to FDIC |  |  |  |  |  |  |  |  |  | 794 | 909 |  |  |
Provision for loan losses charged to operations |  |  |  |  |  |  |  |  | (1,305) | 3,295 | 1,468 |  |  |
Ending balance | 12,009 |  |  |  | 14,294 |  |  |  | 12,009 | 14,294 | 13,908 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 606 | 1,134 | 4,475
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 10,831 | 12,319 | 9,177
Acquired with deteriorated credit quality | 12,009 |  |  | 14,294 | 14,294 |  |  | 13,908 | 14,294 | 13,908 | 13,549 | 12,009 | 14,294 | 13,908
Real estate – 1-4 family mortgage | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 841 |  |  |  | 256 | 841 | 256 |  |  |  |
Ending balance | 572 |  |  |  | 841 |  |  |  | 572 | 841 | 256 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality | 572 |  |  | 841 | 841 |  |  | 256 | 841 | 256 | 256 | 572 | 841 | 256
Real estate – commercial mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 19,059 |  |  |  | 21,111 | 19,059 | 21,111 | 22,759 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (1,791) | (2,123) | (2,613) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 1,565 | 757 | 614 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | (226) | (1,366) | (1,999) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  | (879) | 312 |  |  |
Benefit attributable to FDIC loss share agreements |  |  |  |  |  |  |  |  |  | (48) | (717) |  |  |
Recoveries payable to FDIC |  |  |  |  |  |  |  |  |  | 241 | 756 |  |  |
Provision for loan losses charged to operations |  |  |  |  |  |  |  |  | 4,551 | (686) | 351 |  |  |
Ending balance | 23,384 |  |  |  | 19,059 |  |  |  | 23,384 | 19,059 | 21,111 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 1,867 | 2,445 | 3,099
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 20,625 | 15,008 | 16,916
Acquired with deteriorated credit quality | 23,384 |  |  | 19,059 | 19,059 |  |  | 21,111 | 19,059 | 21,111 | 22,759 | 23,384 | 19,059 | 21,111
Real estate – commercial mortgage | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 1,606 |  |  |  | 1,096 | 1,606 | 1,096 |  |  |  |
Ending balance | 892 |  |  |  | 1,606 |  |  |  | 892 | 1,606 | 1,096 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality | 892 |  |  | 1,606 | 1,606 |  |  | 1,096 | 1,606 | 1,096 | 1,096 | 892 | 1,606 | 1,096
Installment and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 1,518 |  |  |  | 1,380 | 1,518 | 1,380 | 1,261 |  |  |
Charge-offs |  |  |  |  |  |  |  |  | (630) | (717) | (1,021) |  |  |
Recoveries |  |  |  |  |  |  |  |  | 107 | 109 | 109 |  |  |
Net charge-offs |  |  |  |  |  |  |  |  | (523) | (608) | (912) |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  | 787 | 1,027 |  |  |
Benefit attributable to FDIC loss share agreements |  |  |  |  |  |  |  |  |  | (41) | 0 |  |  |
Recoveries payable to FDIC |  |  |  |  |  |  |  |  |  | 0 | 4 |  |  |
Provision for loan losses charged to operations |  |  |  |  |  |  |  |  | 853 | 746 | 1,031 |  |  |
Ending balance | 1,848 |  |  |  | 1,518 |  |  |  | 1,848 | 1,518 | 1,380 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 7 | 115 | 0
Collectively evaluated for impairment |  |  |  |  |  |  |  |  |  |  |  | 1,840 | 1,402 | 1,379
Acquired with deteriorated credit quality | 1,848 |  |  | 1,518 | 1,518 |  |  | 1,380 | 1,518 | 1,380 | 1,261 | 1,848 | 1,518 | 1,380
Installment and Other | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward of the allowance for loan losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 1 |  |  |  | 1 | 1 | 1 |  |  |  |
Ending balance | 1 |  |  |  | 1 |  |  |  | 1 | 1 | 1 |  |  |
Period-End Amount Allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired with deteriorated credit quality | $ 1 |  |  | $ 1 | $ 1 |  |  | $ 1 | $ 1 | $ 1 | $ 1 | $ 1 | $ 1 | $ 1

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- Definition Allowance for loan losses recoveries payable to federal deposit insurance corporation. + References No definition available. + Details
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- Definition Benefit attributable to federal deposit insurance corporation loss share agreements. + References No definition available. + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + 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)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + 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=84173941&loc=SL6953423-111524 + Details
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