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Loans and Allowance for Loan Losses - Allowance for Credit Losses (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance |  | $ 75,670,000 | $ 61,944,000 | $ 67,240,000 | $ 58,980,000
Charged-off loans |  | (6,949,000) | (5,987,000) | (22,316,000) | (16,308,000)
Recovery of previously charged-off loans |  | 2,539,000 | 2,282,000 | 10,003,000 | 5,103,000
Provision for loan losses |  | 8,725,000 | 6,920,000 | 25,058,000 | 17,384,000
Ending Balance |  | 79,985,000 | 65,159,000 | 79,985,000 | 65,159,000
Loans acquired with deteriorated credit quality (1) |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance | [1] |  |  | 573,000 |
Ending Balance | [1] | 11,000 |  | 11,000 |
Commercial real estate - mortgage |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance |  | 24,848,000 | 16,002,000 | 21,188,000 | 13,655,000
Charged-off loans |  | (1,968,000) | (572,000) | (2,930,000) | (581,000)
Recovery of previously charged-off loans |  | 63,000 | 169,000 | 1,517,000 | 184,000
Provision for loan losses |  | 3,574,000 | 5,191,000 | 6,742,000 | 7,532,000
Ending Balance |  | 26,517,000 | 20,790,000 | 26,517,000 | 20,790,000
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] | 9,000 |  | 9,000 |
Consumer real estate - mortgage |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance |  | 5,853,000 | 7,835,000 | 5,031,000 | 6,564,000
Charged-off loans |  | (262,000) | (395,000) | (1,533,000) | (663,000)
Recovery of previously charged-off loans |  | 987,000 | 565,000 | 2,190,000 | 1,147,000
Provision for loan losses |  | 149,000 | (2,702,000) | 1,039,000 | (1,745,000)
Ending Balance |  | 6,727,000 | 5,303,000 | 6,727,000 | 5,303,000
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] | 2,000 |  | 2,000 |
Construction and land development |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance |  | 10,984,000 | 5,126,000 | 8,962,000 | 3,624,000
Charged-off loans |  | (24,000) | (99,000) | (36,000) | (99,000)
Recovery of previously charged-off loans |  | 70,000 | 716,000 | 1,645,000 | 845,000
Provision for loan losses |  | (48,000) | 1,780,000 | 411,000 | 3,153,000
Ending Balance |  | 10,982,000 | 7,523,000 | 10,982,000 | 7,523,000
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] | 0 |  | 0 |
Commercial and industrial |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance |  | 28,338,000 | 24,235,000 | 24,863,000 | 24,743,000
Charged-off loans |  | (3,336,000) | (1,625,000) | (7,600,000) | (3,278,000)
Recovery of previously charged-off loans |  | 1,037,000 | 562,000 | 2,492,000 | 1,264,000
Provision for loan losses |  | 4,085,000 | 235,000 | 10,369,000 | 678,000
Ending Balance |  | 30,124,000 | 23,407,000 | 30,124,000 | 23,407,000
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] | 0 |  | 0 |
Consumer and other |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance |  | 5,172,000 | 7,549,000 | 5,874,000 | 9,520,000
Charged-off loans |  | (1,359,000) | (3,296,000) | (10,217,000) | (11,687,000)
Recovery of previously charged-off loans |  | 382,000 | 270,000 | 2,159,000 | 1,663,000
Provision for loan losses |  | 618,000 | 2,396,000 | 6,997,000 | 7,423,000
Ending Balance |  | 4,813,000 | 6,919,000 | 4,813,000 | 6,919,000
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 |  | 0 |
Unallocated |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance |  | 475,000 | 1,197,000 | 1,322,000 | 874,000
Charged-off loans |  | 0 | 0 | 0 | 0
Recovery of previously charged-off loans |  | 0 | 0 | 0 | 0
Provision for loan losses |  | 347,000 | 20,000 | (500,000) | 343,000
Ending Balance |  | 822,000 | $ 1,217,000 | 822,000 | $ 1,217,000
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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