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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses - Details on Allowance for Loan Losses and Recorded Investment by Loan Classification (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | 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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 67,240,000 |  |  |  | $ 58,980,000 |  |  |  | $ 65,432,000 | $ 67,240,000 | $ 58,980,000 | $ 65,432,000
Charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | (30,400,000) | (22,046,000) | (31,112,000)
Recovery of previously charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | 12,358,000 | 6,642,000 | 6,332,000
Provision for loan losses | $ 9,319,000 | $ 8,725,000 | $ 9,402,000 | 6,931,000 | $ 6,281,000 | $ 6,920,000 | $ 6,812,000 | 3,651,000 | $ 3,046,000 | $ 6,108,000 | $ 5,280,000 | 3,894,000 | 34,377,000 | 23,664,000 | 18,328,000
Ending Balance | 83,575,000 |  |  |  | 67,240,000 |  |  |  | 58,980,000 |  |  |  | 83,575,000 | 67,240,000 | 58,980,000
Collectively Evaluated for Impairment | 78,934,000 |  |  |  | 63,147,000 |  |  |  | 57,014,000 |  |  |  | 78,934,000 | 63,147,000 | 57,014,000
Individually Evaluated for Impairment | 3,964,000 |  |  |  | 2,198,000 |  |  |  | 1,092,000 |  |  |  | 3,964,000 | 2,198,000 | 1,092,000
Ending Balance | 83,575,000 |  |  |  | 67,240,000 |  |  |  | 58,980,000 |  |  |  | 83,575,000 | 67,240,000 | 58,980,000
Collectively Evaluated for Impairment | 17,599,074,000 |  |  |  | 15,531,482,000 |  |  |  | 8,407,338,000 |  |  |  | 17,599,074,000 | 15,531,482,000 | 8,407,338,000
Individually Evaluated for Impairment | 83,146,000 |  |  |  | 58,979,000 |  |  |  | 33,750,000 |  |  |  | 83,146,000 | 58,979,000 | 33,750,000
Loans acquired with deteriorated credit quality | 25,329,000 |  |  |  | 42,655,000 |  |  |  | 8,837,000 |  |  |  | 25,329,000 | 42,655,000 | 8,837,000
Loans | 17,707,549,000 |  |  |  | 15,633,116,000 |  |  |  | 8,449,925,000 |  |  |  | 17,707,549,000 | 15,633,116,000 | 8,449,925,000
Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 0 |  |  |  | 573,000 |  |  |  | 0 |  |  |  | 0 | 573,000 | 0
Commercial Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 21,188,000 |  |  |  | 13,655,000 |  |  |  | 15,513,000 | 21,188,000 | 13,655,000 | 15,513,000
Charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | (3,030,000) | (633,000) | (276,000)
Recovery of previously charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | 2,096,000 | 671,000 | 208,000
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 6,692,000 | 7,495,000 | (1,790,000)
Ending Balance | 26,946,000 |  |  |  | 21,188,000 |  |  |  | 13,655,000 |  |  |  | 26,946,000 | 21,188,000 | 13,655,000
Collectively Evaluated for Impairment | 26,222,000 |  |  |  | 20,753,000 |  |  |  | 13,595,000 |  |  |  | 26,222,000 | 20,753,000 | 13,595,000
Individually Evaluated for Impairment | 724,000 |  |  |  | 95,000 |  |  |  | 60,000 |  |  |  | 724,000 | 95,000 | 60,000
Ending Balance | 26,946,000 |  |  |  | 21,188,000 |  |  |  | 13,655,000 |  |  |  | 26,946,000 | 21,188,000 | 13,655,000
Collectively Evaluated for Impairment | 7,124,117,000 |  |  |  | 6,630,593,000 |  |  |  | 3,188,361,000 |  |  |  | 7,124,117,000 | 6,630,593,000 | 3,188,361,000
Individually Evaluated for Impairment | 28,838,000 |  |  |  | 18,214,000 |  |  |  | 2,750,000 |  |  |  | 28,838,000 | 18,214,000 | 2,750,000
Loans acquired with deteriorated credit quality | 11,999,000 |  |  |  | 20,803,000 |  |  |  | 2,385,000 |  |  |  | 11,999,000 | 20,803,000 | 2,385,000
Loans | 7,164,954,000 |  |  |  | 6,669,610,000 |  |  |  | 3,193,496,000 |  |  |  | 7,164,954,000 | 6,669,610,000 | 3,193,496,000
Commercial Real Estate | Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 0 |  |  |  | 340,000 |  |  |  | 0 |  |  |  | 0 | 340,000 | 0
Consumer Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 5,031,000 |  |  |  | 6,564,000 |  |  |  | 7,220,000 | 5,031,000 | 6,564,000 | 7,220,000
Charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | (1,593,000) | (1,461,000) | (788,000)
Recovery of previously charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | 2,653,000 | 1,516,000 | 546,000
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 1,579,000 | (1,588,000) | (414,000)
Ending Balance | 7,670,000 |  |  |  | 5,031,000 |  |  |  | 6,564,000 |  |  |  | 7,670,000 | 5,031,000 | 6,564,000
Collectively Evaluated for Impairment | 6,227,000 |  |  |  | 4,460,000 |  |  |  | 5,874,000 |  |  |  | 6,227,000 | 4,460,000 | 5,874,000
Individually Evaluated for Impairment | 1,443,000 |  |  |  | 410,000 |  |  |  | 690,000 |  |  |  | 1,443,000 | 410,000 | 690,000
Ending Balance | 7,670,000 |  |  |  | 5,031,000 |  |  |  | 6,564,000 |  |  |  | 7,670,000 | 5,031,000 | 6,564,000
Collectively Evaluated for Impairment | 2,808,142,000 |  |  |  | 2,534,996,000 |  |  |  | 1,174,456,000 |  |  |  | 2,808,142,000 | 2,534,996,000 | 1,174,456,000
Individually Evaluated for Impairment | 27,111,000 |  |  |  | 12,172,000 |  |  |  | 8,941,000 |  |  |  | 27,111,000 | 12,172,000 | 8,941,000
Loans acquired with deteriorated credit quality | 9,194,000 |  |  |  | 14,046,000 |  |  |  | 2,520,000 |  |  |  | 9,194,000 | 14,046,000 | 2,520,000
Loans | 2,844,447,000 |  |  |  | 2,561,214,000 |  |  |  | 1,185,917,000 |  |  |  | 2,844,447,000 | 2,561,214,000 | 1,185,917,000
Consumer Real Estate | Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 0 |  |  |  | 161,000 |  |  |  | 0 |  |  |  | 0 | 161,000 | 0
Construction and Land Development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 8,962,000 |  |  |  | 3,624,000 |  |  |  | 2,903,000 | 8,962,000 | 3,624,000 | 2,903,000
Charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | (74,000) | (137,000) | (231,000)
Recovery of previously charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | 1,863,000 | 1,136,000 | 545,000
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 377,000 | 4,339,000 | 407,000
Ending Balance | 11,128,000 |  |  |  | 8,962,000 |  |  |  | 3,624,000 |  |  |  | 11,128,000 | 8,962,000 | 3,624,000
Collectively Evaluated for Impairment | 11,100,000 |  |  |  | 8,879,000 |  |  |  | 3,604,000 |  |  |  | 11,100,000 | 8,879,000 | 3,604,000
Individually Evaluated for Impairment | 28,000 |  |  |  | 66,000 |  |  |  | 20,000 |  |  |  | 28,000 | 66,000 | 20,000
Ending Balance | 11,128,000 |  |  |  | 8,962,000 |  |  |  | 3,624,000 |  |  |  | 11,128,000 | 8,962,000 | 3,624,000
Collectively Evaluated for Impairment | 2,066,613,000 |  |  |  | 1,896,553,000 |  |  |  | 906,053,000 |  |  |  | 2,066,613,000 | 1,896,553,000 | 906,053,000
Individually Evaluated for Impairment | 2,367,000 |  |  |  | 5,167,000 |  |  |  | 3,212,000 |  |  |  | 2,367,000 | 5,167,000 | 3,212,000
Loans acquired with deteriorated credit quality | 3,475,000 |  |  |  | 6,568,000 |  |  |  | 3,408,000 |  |  |  | 3,475,000 | 6,568,000 | 3,408,000
Loans | 2,072,455,000 |  |  |  | 1,908,288,000 |  |  |  | 912,673,000 |  |  |  | 2,072,455,000 | 1,908,288,000 | 912,673,000
Construction and Land Development | Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 0 |  |  |  | 17,000 |  |  |  | 0 |  |  |  | 0 | 17,000 | 0
Commercial and Industrial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 24,863,000 |  |  |  | 24,743,000 |  |  |  | 23,643,000 | 24,863,000 | 24,743,000 | 23,643,000
Charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | (13,175,000) | (4,297,000) | (5,801,000)
Recovery of previously charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | 3,035,000 | 1,317,000 | 2,138,000
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 17,008,000 | 3,100,000 | 4,763,000
Ending Balance | 31,731,000 |  |  |  | 24,863,000 |  |  |  | 24,743,000 |  |  |  | 31,731,000 | 24,863,000 | 24,743,000
Collectively Evaluated for Impairment | 30,290,000 |  |  |  | 23,181,000 |  |  |  | 24,648,000 |  |  |  | 30,290,000 | 23,181,000 | 24,648,000
Individually Evaluated for Impairment | 1,441,000 |  |  |  | 1,627,000 |  |  |  | 95,000 |  |  |  | 1,441,000 | 1,627,000 | 95,000
Ending Balance | 31,731,000 |  |  |  | 24,863,000 |  |  |  | 24,743,000 |  |  |  | 31,731,000 | 24,863,000 | 24,743,000
Collectively Evaluated for Impairment | 5,246,913,000 |  |  |  | 4,116,677,000 |  |  |  | 2,872,855,000 |  |  |  | 5,246,913,000 | 4,116,677,000 | 2,872,855,000
Individually Evaluated for Impairment | 23,847,000 |  |  |  | 23,426,000 |  |  |  | 18,331,000 |  |  |  | 23,847,000 | 23,426,000 | 18,331,000
Loans acquired with deteriorated credit quality | 661,000 |  |  |  | 1,238,000 |  |  |  | 524,000 |  |  |  | 661,000 | 1,238,000 | 524,000
Loans | 5,271,421,000 |  |  |  | 4,141,341,000 |  |  |  | 2,891,710,000 |  |  |  | 5,271,421,000 | 4,141,341,000 | 2,891,710,000
Commercial and Industrial | Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 0 |  |  |  | 55,000 |  |  |  | 0 |  |  |  | 0 | 55,000 | 0
Consumer and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 5,874,000 |  |  |  | 9,520,000 |  |  |  | 15,616,000 | 5,874,000 | 9,520,000 | 15,616,000
Charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | (12,528,000) | (15,518,000) | (24,016,000)
Recovery of previously charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  | 2,711,000 | 2,002,000 | 2,895,000
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 9,366,000 | 9,870,000 | 15,025,000
Ending Balance | 5,423,000 |  |  |  | 5,874,000 |  |  |  | 9,520,000 |  |  |  | 5,423,000 | 5,874,000 | 9,520,000
Collectively Evaluated for Impairment | 5,095,000 |  |  |  | 5,874,000 |  |  |  | 9,293,000 |  |  |  | 5,095,000 | 5,874,000 | 9,293,000
Individually Evaluated for Impairment | 328,000 |  |  |  | 0 |  |  |  | 227,000 |  |  |  | 328,000 | 0 | 227,000
Ending Balance | 5,423,000 |  |  |  | 5,874,000 |  |  |  | 9,520,000 |  |  |  | 5,423,000 | 5,874,000 | 9,520,000
Collectively Evaluated for Impairment | 353,289,000 |  |  |  | 352,663,000 |  |  |  | 265,613,000 |  |  |  | 353,289,000 | 352,663,000 | 265,613,000
Individually Evaluated for Impairment | 983,000 |  |  |  | 0 |  |  |  | 516,000 |  |  |  | 983,000 | 0 | 516,000
Loans acquired with deteriorated credit quality | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Loans | 354,272,000 |  |  |  | 352,663,000 |  |  |  | 266,129,000 |  |  |  | 354,272,000 | 352,663,000 | 266,129,000
Consumer and Other | Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually Evaluated for Impairment | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Unallocated Financing Receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 1,322,000 |  |  |  | $ 874,000 |  |  |  | $ 537,000 | 1,322,000 | 874,000 | 537,000
Charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Recovery of previously charged-off loans |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | (645,000) | 448,000 | 337,000
Ending Balance | 677,000 |  |  |  | 1,322,000 |  |  |  | 874,000 |  |  |  | 677,000 | 1,322,000 | 874,000
Ending Balance | $ 677,000 |  |  |  | $ 1,322,000 |  |  |  | $ 874,000 |  |  |  | $ 677,000 | $ 1,322,000 | $ 874,000

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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