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Loans and Allowance for Loan Losses - Allowance for Credit Losses (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance |  | $ 67,240,000 | $ 58,980,000
Charged-off loans |  | (8,669,000) | (5,162,000)
Recovery of previously charged-off loans |  | 4,702,000 | 881,000
Provision for loan losses |  | 6,931,000 | 3,651,000
Ending Balance |  | 70,204,000 | 58,350,000
Loans acquired with deteriorated credit quality (1) |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | [1] | 573,000 |
Ending Balance | [1] | 138,000 |
Commercial real estate - mortgage |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance |  | 21,188,000 | 13,655,000
Charged-off loans |  | (728,000) | 0
Recovery of previously charged-off loans |  | 1,396,000 | 6,000
Provision for loan losses |  | 832,000 | 507,000
Ending Balance |  | 22,688,000 | 14,168,000
Commercial real estate - mortgage | Loans acquired with deteriorated credit quality (1) |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | [1] | 340,000 |
Ending Balance | [1] | 107,000 |
Consumer real estate - mortgage |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance |  | 5,031,000 | 6,564,000
Charged-off loans |  | (336,000) | (61,000)
Recovery of previously charged-off loans |  | 666,000 | 170,000
Provision for loan losses |  | (261,000) | 546,000
Ending Balance |  | 5,100,000 | 7,219,000
Consumer real estate - mortgage | Loans acquired with deteriorated credit quality (1) |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | [1] | 161,000 |
Ending Balance | [1] | 27,000 |
Construction and land development |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance |  | 8,962,000 | 3,624,000
Charged-off loans |  | (2,000) | 0
Recovery of previously charged-off loans |  | 565,000 | 33,000
Provision for loan losses |  | 591,000 | 784,000
Ending Balance |  | 10,116,000 | 4,441,000
Construction and land development | Loans acquired with deteriorated credit quality (1) |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | [1] | 17,000 |
Ending Balance | [1] | 2,000 |
Commercial and industrial |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance |  | 24,863,000 | 24,743,000
Charged-off loans |  | (2,540,000) | (1,158,000)
Recovery of previously charged-off loans |  | 888,000 | 140,000
Provision for loan losses |  | 3,437,000 | (813,000)
Ending Balance |  | 26,648,000 | 22,912,000
Commercial and industrial | Loans acquired with deteriorated credit quality (1) |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | [1] | 55,000 |
Ending Balance | [1] | 2,000 |
Consumer and other |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance |  | 5,874,000 | 9,520,000
Charged-off loans |  | (5,063,000) | (3,943,000)
Recovery of previously charged-off loans |  | 1,187,000 | 532,000
Provision for loan losses |  | 3,478,000 | 2,368,000
Ending Balance |  | 5,476,000 | 8,477,000
Consumer and other | Loans acquired with deteriorated credit quality (1) |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | [1] | 0 |
Ending Balance | [1] | 0 |
Unallocated |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance |  | 1,322,000 | 874,000
Charged-off loans |  | 0 | 0
Recovery of previously charged-off loans |  | 0 | 0
Provision for loan losses |  | (1,146,000) | 259,000
Ending Balance |  | 176,000 | $ 1,133,000
Unallocated | Loans acquired with deteriorated credit quality (1) |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | [1] |  |
Ending Balance | [1] |  |
[1] | (1) Loans acquired with deteriorated credit quality are recorded at fair value at the time of acquisition. An allowance for loan losses is recorded resulting from subsequent credit deterioration.

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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=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + 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)(4) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + 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 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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