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Loans and Allowance for Loan Losses - Allowance for Credit Losses (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance |  | $ 70,204,000 | $ 58,350,000 | $ 67,240,000 | $ 58,980,000
Charged-off loans |  | (6,698,000) | (5,157,000) | (15,367,000) | (10,321,000)
Recovery of previously charged-off loans |  | 2,762,000 | 1,939,000 | 7,464,000 | 2,822,000
Provision for loan losses |  | 9,402,000 | 6,812,000 | 16,333,000 | 10,463,000
Ending Balance |  | 75,670,000 | 61,944,000 | 75,670,000 | 61,944,000
Loans acquired with deteriorated credit quality (1) |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance | [1] |  |  | 573,000 |
Ending Balance | [1] | 468,000 |  | 468,000 |
Commercial real estate - mortgage |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance |  | 22,688,000 | 14,168,000 | 21,188,000 | 13,655,000
Charged-off loans |  | (234,000) | (8,000) | (962,000) | (9,000)
Recovery of previously charged-off loans |  | 58,000 | 9,000 | 1,454,000 | 15,000
Provision for loan losses |  | 2,336,000 | 1,833,000 | 3,168,000 | 2,341,000
Ending Balance |  | 24,848,000 | 16,002,000 | 24,848,000 | 16,002,000
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] | 362,000 |  | 362,000 |
Consumer real estate - mortgage |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance |  | 5,100,000 | 7,219,000 | 5,031,000 | 6,564,000
Charged-off loans |  | (935,000) | (206,000) | (1,271,000) | (268,000)
Recovery of previously charged-off loans |  | 537,000 | 412,000 | 1,203,000 | 582,000
Provision for loan losses |  | 1,151,000 | 410,000 | 890,000 | 957,000
Ending Balance |  | 5,853,000 | 7,835,000 | 5,853,000 | 7,835,000
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] | 97,000 |  | 97,000 |
Construction and land development |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance |  | 10,116,000 | 4,441,000 | 8,962,000 | 3,624,000
Charged-off loans |  | (10,000) | 0 | (12,000) | 0
Recovery of previously charged-off loans |  | 1,010,000 | 96,000 | 1,575,000 | 129,000
Provision for loan losses |  | 132,000 | 589,000 | 459,000 | 1,373,000
Ending Balance |  | 10,984,000 | 5,126,000 | 10,984,000 | 5,126,000
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] | 7,000 |  | 7,000 |
Commercial and industrial |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance |  | 26,648,000 | 22,912,000 | 24,863,000 | 24,743,000
Charged-off loans |  | (1,724,000) | (495,000) | (4,264,000) | (1,653,000)
Recovery of previously charged-off loans |  | 567,000 | 560,000 | 1,455,000 | 702,000
Provision for loan losses |  | 2,847,000 | 1,258,000 | 6,284,000 | 443,000
Ending Balance |  | 28,338,000 | 24,235,000 | 28,338,000 | 24,235,000
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 |  | 2,000 |
Consumer and other |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Beginning Balance |  | 5,476,000 | 8,477,000 | 5,874,000 | 9,520,000
Charged-off loans |  | (3,795,000) | (4,448,000) | (8,858,000) | (8,391,000)
Recovery of previously charged-off loans |  | 590,000 | 862,000 | 1,777,000 | 1,394,000
Provision for loan losses |  | 2,901,000 | 2,658,000 | 6,379,000 | 5,026,000
Ending Balance |  | 5,172,000 | 7,549,000 | 5,172,000 | 7,549,000
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 |  | 176,000 | 1,133,000 | 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 |  | 299,000 | 64,000 | 847,000 | 323,000
Ending Balance |  | 475,000 | $ 1,197,000 | 475,000 | $ 1,197,000
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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