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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
	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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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.

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