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Allowance for Loan Losses - Composition of the Allowance for Loan Losses (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total loans |  | $ 5,692,132,000 | $ 5,372,483,000 | $ 5,271,857,000 |
Loans and Leases Receivable, Allowance |  | 51,512,000 | 49,988,000 | 50,624,000 | $ 56,494,000
Ending allowance balance attributed to loans: |  |  |  |  |
Individually evaluated for impairment |  | 2,273,000 | 684,000 |  |
Collectively evaluated for impairment |  | 49,239,000 | 49,304,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses |  | 0 |  |  |
Total ending allowance balance |  | 51,512,000 | 49,988,000 |  |
Loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 48,135,000 | 56,545,000 |  |
Loans collectively evaluated for impairment |  | 5,640,054,000 | 5,315,938,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 3,943,000 |  |  |
Total ending loan balance |  | $ 5,692,132,000 | $ 5,372,483,000 |  |
Allowance for loan losses as a percentage of loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 4.72% | 1.21% |  |
Loans collectively evaluated for impairment |  | 0.87% | 0.93% |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% |  |  |
Total |  | 0.90% | 0.93% |  |
Recorded investment: |  |  |  |  |
Loans individually evaluated for impairment |  | $ 48,144,000 | $ 56,564,000 |  |
Loans collectively evaluated for impairment |  | 5,657,693,000 | 5,332,578,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 3,961,000 |  |  |
Recorded Investment |  | 5,709,798,000 | 5,389,142,000 |  |
Financing Receivable, Allowance for Credit Losses, Write-downs |  | 13,552,000 | 19,403,000 | 20,799,000 |
Financing Receivable, Allowance for Credit Losses, Recovery |  | (7,131,000) | (10,210,000) | (20,030,000) |
Financing Receivables Allowance For Credit Losses Net Charge Offs |  | 6,421,000 | 9,193,000 | 769,000 |
Provision for Loan, Lease, and Other Losses |  | 7,945,000 | 8,557,000 | (5,101,000) |
Commercial, financial and agricultural |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 16,777,000 | 15,022,000 | 13,434,000 | 13,694,000
Ending allowance balance attributed to loans: |  |  |  |  |
Individually evaluated for impairment |  | 2,169,000 | 681,000 |  |
Collectively evaluated for impairment |  | 14,608,000 | 14,341,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses |  | 0 |  |  |
Total ending allowance balance |  | 16,777,000 | 15,022,000 |  |
Loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 15,119,000 | 18,034,000 |  |
Loans collectively evaluated for impairment |  | 1,057,520,000 | 1,035,419,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 147,000 |  |  |
Total ending loan balance | [1] | $ 1,072,786,000 | $ 1,053,453,000 |  |
Allowance for loan losses as a percentage of loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 14.35% | 3.78% |  |
Loans collectively evaluated for impairment |  | 1.38% | 1.39% |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% |  |  |
Total |  | 1.56% | 1.43% |  |
Recorded investment: |  |  |  |  |
Loans individually evaluated for impairment |  | $ 15,120,000 | $ 18,039,000 |  |
Loans collectively evaluated for impairment |  | 1,062,121,000 | 1,039,827,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 148,000 |  |  |
Recorded Investment | [1] | 1,077,389,000 | 1,057,866,000 |  |
Financing Receivable, Allowance for Credit Losses, Write-downs |  | 2,796,000 | 6,017,000 | 5,786,000 |
Financing Receivable, Allowance for Credit Losses, Recovery |  | (1,221,000) | (809,000) | (1,259,000) |
Financing Receivables Allowance For Credit Losses Net Charge Offs |  | 1,575,000 | 5,208,000 | 4,527,000 |
Provision for Loan, Lease, and Other Losses |  | 3,330,000 | 6,796,000 | 4,267,000 |
Commercial real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 9,768,000 | 9,601,000 | 10,432,000 | 9,197,000
Ending allowance balance attributed to loans: |  |  |  |  |
Individually evaluated for impairment |  | 86,000 | 2,000 |  |
Collectively evaluated for impairment |  | 9,682,000 | 9,599,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses |  | 0 |  |  |
Total ending allowance balance |  | 9,768,000 | 9,601,000 |  |
Loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 28,418,000 | 18,131,000 |  |
Loans collectively evaluated for impairment |  | 1,251,579,000 | 1,149,476,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 3,048,000 |  |  |
Total ending loan balance | [1] | $ 1,283,045,000 | $ 1,167,607,000 |  |
Allowance for loan losses as a percentage of loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 0.30% | 0.01% |  |
Loans collectively evaluated for impairment |  | 0.77% | 0.84% |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% |  |  |
Total |  | 0.76% | 0.82% |  |
Recorded investment: |  |  |  |  |
Loans individually evaluated for impairment |  | $ 28,426,000 | $ 18,142,000 |  |
Loans collectively evaluated for impairment |  | 1,256,310,000 | 1,153,748,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 3,059,000 |  |  |
Recorded Investment | [1] | 1,287,795,000 | 1,171,890,000 |  |
Financing Receivable, Allowance for Credit Losses, Write-downs |  | 281,000 | 1,798,000 | 412,000 |
Financing Receivable, Allowance for Credit Losses, Recovery |  | (272,000) | (810,000) | (3,671,000) |
Financing Receivables Allowance For Credit Losses Net Charge Offs |  | 9,000 | 988,000 | (3,259,000) |
Provision for Loan, Lease, and Other Losses |  | 176,000 | 157,000 | (2,024,000) |
Construction real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 4,463,000 | 4,430,000 | 5,247,000 | 8,564,000
Ending allowance balance attributed to loans: |  |  |  |  |
Individually evaluated for impairment |  | 0 | 0 |  |
Collectively evaluated for impairment |  | 4,463,000 | 4,430,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses |  | 0 |  |  |
Total ending allowance balance |  | 4,463,000 | 4,430,000 |  |
Loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 1,866,000 | 1,322,000 |  |
Loans collectively evaluated for impairment |  | 245,909,000 | 180,148,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 499,000 |  |  |
Total ending loan balance |  | $ 248,274,000 | $ 181,470,000 |  |
Allowance for loan losses as a percentage of loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 0.00% | 0.00% |  |
Loans collectively evaluated for impairment |  | 1.81% | 2.46% |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% |  |  |
Total |  | 1.80% | 2.44% |  |
Recorded investment: |  |  |  |  |
Loans individually evaluated for impairment |  | $ 1,866,000 | $ 1,324,000 |  |
Loans collectively evaluated for impairment |  | 246,864,000 | 180,693,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 503,000 |  |  |
Recorded Investment |  | 249,233,000 | 182,017,000 |  |
Financing Receivable, Allowance for Credit Losses, Write-downs |  | 72,000 | 105,000 | 1,436,000 |
Financing Receivable, Allowance for Credit Losses, Recovery |  | (712,000) | (2,124,000) | (8,559,000) |
Financing Receivables Allowance For Credit Losses Net Charge Offs |  | (640,000) | (2,019,000) | (7,123,000) |
Provision for Loan, Lease, and Other Losses |  | (607,000) | (2,836,000) | (10,440,000) |
Residential real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 8,731,000 | 9,321,000 | 10,958,000 | 13,514,000
Ending allowance balance attributed to loans: |  |  |  |  |
Individually evaluated for impairment |  | 18,000 | 1,000 |  |
Collectively evaluated for impairment |  | 8,713,000 | 9,320,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses |  | 0 |  |  |
Total ending allowance balance |  | 8,731,000 | 9,321,000 |  |
Loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 2,732,000 | 19,058,000 |  |
Loans collectively evaluated for impairment |  | 1,790,637,000 | 1,706,166,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 249,000 |  |  |
Total ending loan balance |  | $ 1,793,618,000 | $ 1,725,224,000 |  |
Allowance for loan losses as a percentage of loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 0.66% | 0.01% |  |
Loans collectively evaluated for impairment |  | 0.49% | 0.55% |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% |  |  |
Total |  | 0.49% | 0.54% |  |
Recorded investment: |  |  |  |  |
Loans individually evaluated for impairment |  | $ 2,732,000 | $ 19,059,000 |  |
Loans collectively evaluated for impairment |  | 1,794,207,000 | 1,709,737,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 251,000 |  |  |
Recorded Investment |  | 1,797,190,000 | 1,728,796,000 |  |
Financing Receivable, Allowance for Credit Losses, Write-downs |  | 441,000 | 1,208,000 | 3,014,000 |
Financing Receivable, Allowance for Credit Losses, Recovery |  | (844,000) | (1,863,000) | (2,446,000) |
Financing Receivables Allowance For Credit Losses Net Charge Offs |  | (403,000) | (655,000) | 568,000 |
Provision for Loan, Lease, and Other Losses |  | (993,000) | (2,292,000) | (1,988,000) |
Consumer |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 11,773,000 | 11,614,000 | 10,553,000 | 11,524,000
Ending allowance balance attributed to loans: |  |  |  |  |
Individually evaluated for impairment |  | 0 | 0 |  |
Collectively evaluated for impairment |  | 11,773,000 | 11,614,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses |  | 0 |  |  |
Total ending allowance balance |  | 11,773,000 | 11,614,000 |  |
Loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 0 | 0 |  |
Loans collectively evaluated for impairment |  | 1,292,136,000 | 1,241,736,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 0 |  |  |
Total ending loan balance |  | $ 1,292,136,000 | $ 1,241,736,000 |  |
Allowance for loan losses as a percentage of loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 0.00% | 0.00% |  |
Loans collectively evaluated for impairment |  | 0.91% | 0.94% |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% |  |  |
Total |  | 0.91% | 0.94% |  |
Recorded investment: |  |  |  |  |
Loans individually evaluated for impairment |  | $ 0 | $ 0 |  |
Loans collectively evaluated for impairment |  | 1,295,892,000 | 1,245,544,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 |  |  |
Recorded Investment |  | 1,295,892,000 | 1,245,544,000 |  |
Financing Receivable, Allowance for Credit Losses, Write-downs |  | 9,962,000 | 10,275,000 | 10,151,000 |
Financing Receivable, Allowance for Credit Losses, Recovery |  | (4,078,000) | (4,603,000) | (4,094,000) |
Financing Receivables Allowance For Credit Losses Net Charge Offs |  | 5,884,000 | 5,672,000 | 6,057,000 |
Provision for Loan, Lease, and Other Losses |  | 6,043,000 | 6,733,000 | 5,086,000 |
Leases |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 0 | 0 | 0 | $ 1,000
Ending allowance balance attributed to loans: |  |  |  |  |
Individually evaluated for impairment |  | 0 | 0 |  |
Collectively evaluated for impairment |  | 0 | 0 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses |  | 0 |  |  |
Total ending allowance balance |  | 0 | 0 |  |
Loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 0 | 0 |  |
Loans collectively evaluated for impairment |  | 2,273,000 | 2,993,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 0 |  |  |
Total ending loan balance |  | $ 2,273,000 | $ 2,993,000 |  |
Allowance for loan losses as a percentage of loan balance: |  |  |  |  |
Loans individually evaluated for impairment |  | 0.00% | 0.00% |  |
Loans collectively evaluated for impairment |  | 0.00% | 0.00% |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% |  |  |
Total |  | 0.00% | 0.00% |  |
Recorded investment: |  |  |  |  |
Loans individually evaluated for impairment |  | $ 0 | $ 0 |  |
Loans collectively evaluated for impairment |  | 2,299,000 | 3,029,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 |  |  |
Recorded Investment |  | 2,299,000 | 3,029,000 |  |
Financing Receivable, Allowance for Credit Losses, Write-downs |  | 0 | 0 | 0 |
Financing Receivable, Allowance for Credit Losses, Recovery |  | (4,000) | (1,000) | (1,000) |
Financing Receivables Allowance For Credit Losses Net Charge Offs |  | (4,000) | (1,000) | (1,000) |
Provision for Loan, Lease, and Other Losses |  | (4,000) | (1,000) | $ (2,000) |
Purchased credit impaired [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total loans |  | 3,961,000 |  |  |
Purchased credit impaired [Member] | Commercial real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total loans |  | 3,059,000 |  |  |
Purchased credit impaired [Member] | Leases |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total loans |  | 0 | $ 0 |  |
Purchased credit impaired [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Total loans |  | 475,000 |  |  |
Ending allowance balance attributed to loans: |  |  |  |  |
Individually evaluated for impairment |  | $ 0 |  |  |
[1] | Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.

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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 + Details
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- Definition The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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