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Allowance for Credit Losses (ACL) - Aggregated analysis of the changes in allowance for loan losses Details (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2020	Mar. 31, 2020
Allowance for loan losses:
Balance at beginning of period	$ 56,927,000
Charge-offs	(14,602,000)
Recoveries	11,777,000
Provision (benefit)	89,923,000
Balance at end of period	457,309,000	$ 56,927,000
Loans individually evaluated for impairment	1,249,000
Loans collectively evaluated for impairment	415,929,000
Loans
Loans individually evaluated for impairment				$ 1,000,000.0	$ 500,000
Total loans	24,664,134,000	11,375,104,000
Construction and land development | Commercial loans
Loans
Total loans	1,899,066,000	1,017,261,000
Commercial non-owner occupied | Commercial loans
Loans
Total loans	5,931,323,000	2,323,967,000
Consumer Owner Occupied Loans | Consumer
Loans
Total loans	4,108,042,000	2,706,960,000
Home equity loans | Consumer
Loans
Total loans	1,336,689,000	758,020,000
Commercial and industrial | Commercial loans
Loans
Total loans	5,047,147,000	1,386,327,000
Other income producing property | Commercial loans
Loans
Total loans	587,448,000	346,554,000
Consumer | Consumer
Loans
Total loans	894,334,000	663,422,000
Other loans | Consumer
Loans
Total loans	17,993,000	13,892,000
Non-acquired loans
Allowance for loan losses:
Balance at beginning of period	56,927,000	51,194,000	$ 43,448,000
Charge-offs		(6,917,000)	(6,012,000)
Recoveries		3,367,000	2,995,000
Provision (benefit)		9,283,000	10,763,000
Balance at end of period		56,927,000	51,194,000
Loans individually evaluated for impairment		1,346,000	1,628,000
Loans collectively evaluated for impairment		55,581,000	49,566,000
Loans
Loans individually evaluated for impairment		58,532,000	57,018,000
Loans collectively evaluated for impairment		9,194,299,000	7,876,268,000
Total loans		9,252,831,000	7,933,286,000
Non-acquired loans | Commercial loans
Loans
Total loans		6,062,991,000
Non-acquired loans | Consumer
Loans
Total loans		3,189,840,000
Non-acquired loans | Real estate | Consumer
Loans
Total loans		2,637,467,000
Non-acquired loans | Construction and land development
Allowance for loan losses:
Balance at beginning of period	6,104,000	5,682,000	5,921,000
Charge-offs		(78,000)	(76,000)
Recoveries		1,016,000	1,340,000
Provision (benefit)		(516,000)	(1,503,000)
Balance at end of period		6,104,000	5,682,000
Loans individually evaluated for impairment		617,000	788,000
Loans collectively evaluated for impairment		5,487,000	4,894,000
Loans
Loans individually evaluated for impairment		35,201,000	37,913,000
Loans collectively evaluated for impairment		933,159,000	803,532,000
Total loans		968,360,000	841,445,000
Non-acquired loans | Construction and land development | Commercial loans
Loans
Total loans		968,360,000
Non-acquired loans | Commercial non-owner occupied
Allowance for loan losses:
Balance at beginning of period	10,699,000	8,754,000	6,525,000
Charge-offs		(3,000)
Recoveries		76,000	11,000
Provision (benefit)		1,872,000	2,218,000
Balance at end of period		10,699,000	8,754,000
Loans individually evaluated for impairment			70,000
Loans collectively evaluated for impairment		10,699,000	8,684,000
Loans
Loans individually evaluated for impairment		379,000	1,025,000
Loans collectively evaluated for impairment		1,810,759,000	1,414,526,000
Total loans		1,811,138,000	1,415,551,000
Non-acquired loans | Commercial non-owner occupied | Commercial loans
Loans
Total loans		1,811,138,000
Non-acquired loans | Commercial owner occupied real estate loan
Allowance for loan losses:
Balance at beginning of period	10,581,000	9,369,000	8,128,000
Charge-offs		(87,000)	(659,000)
Recoveries		174,000	145,000
Provision (benefit)		1,125,000	1,755,000
Balance at end of period		10,581,000	9,369,000
Loans individually evaluated for impairment		24,000	27,000
Loans collectively evaluated for impairment		10,557,000	9,342,000
Loans
Loans individually evaluated for impairment		6,575,000	4,142,000
Loans collectively evaluated for impairment		1,777,442,000	1,513,409,000
Total loans		1,784,017,000	1,517,551,000
Non-acquired loans | Commercial owner occupied real estate loan | Commercial loans
Loans
Total loans		1,784,017,000
Non-acquired loans | Consumer Owner Occupied Loans
Allowance for loan losses:
Balance at beginning of period	12,596,000	11,913,000	9,668,000
Charge-offs		(50,000)	(80,000)
Recoveries		213,000	132,000
Provision (benefit)		520,000	2,193,000
Balance at end of period		12,596,000	11,913,000
Loans individually evaluated for impairment		102,000	41,000
Loans collectively evaluated for impairment		12,494,000	11,872,000
Loans
Loans individually evaluated for impairment		5,141,000	6,761,000
Loans collectively evaluated for impairment		2,113,698,000	1,929,504,000
Total loans		2,118,839,000	1,936,265,000
Non-acquired loans | Consumer Owner Occupied Loans | Consumer
Loans
Total loans		2,118,839,000
Non-acquired loans | Home equity loans
Allowance for loan losses:
Balance at beginning of period	3,188,000	3,434,000	3,250,000
Charge-offs		(203,000)	(215,000)
Recoveries		265,000	279,000
Provision (benefit)		(308,000)	120,000
Balance at end of period		3,188,000	3,434,000
Loans individually evaluated for impairment		132,000	142,000
Loans collectively evaluated for impairment		3,056,000	3,292,000
Loans
Loans individually evaluated for impairment		2,461,000	2,826,000
Loans collectively evaluated for impairment		516,167,000	492,322,000
Total loans		518,628,000	495,148,000
Non-acquired loans | Home equity loans | Consumer
Loans
Total loans		518,628,000
Non-acquired loans | Commercial and industrial
Allowance for loan losses:
Balance at beginning of period	8,339,000	7,454,000	5,488,000
Charge-offs		(622,000)	(500,000)
Recoveries		351,000	256,000
Provision (benefit)		1,156,000	2,210,000
Balance at end of period		8,339,000	7,454,000
Loans individually evaluated for impairment		366,000	416,000
Loans collectively evaluated for impairment		7,973,000	7,038,000
Loans
Loans individually evaluated for impairment		6,578,000	1,291,000
Loans collectively evaluated for impairment		1,274,281,000	1,053,661,000
Total loans		1,280,859,000	1,054,952,000
Non-acquired loans | Commercial and industrial | Commercial loans
Loans
Total loans		1,280,859,000
Non-acquired loans | Other income producing property
Allowance for loan losses:
Balance at beginning of period	1,336,000	1,446,000	1,375,000
Charge-offs		(31,000)	(2,000)
Recoveries		94,000	21,000
Provision (benefit)		(173,000)	52,000
Balance at end of period		1,336,000	1,446,000
Loans individually evaluated for impairment		50,000	142,000
Loans collectively evaluated for impairment		1,286,000	1,304,000
Loans
Loans individually evaluated for impairment		2,024,000	2,872,000
Loans collectively evaluated for impairment		216,593,000	211,481,000
Total loans		218,617,000	214,353,000
Non-acquired loans | Other income producing property | Commercial loans
Loans
Total loans		218,617,000
Non-acquired loans | Consumer
Allowance for loan losses:
Balance at beginning of period	3,947,000	3,101,000	2,788,000
Charge-offs		(5,843,000)	(4,480,000)
Recoveries		1,178,000	811,000
Provision (benefit)		5,511,000	3,982,000
Balance at end of period		3,947,000	3,101,000
Loans individually evaluated for impairment		55,000	2,000
Loans collectively evaluated for impairment		3,892,000	3,099,000
Loans
Loans individually evaluated for impairment		173,000	188,000
Loans collectively evaluated for impairment		538,308,000	448,476,000
Total loans		538,481,000	448,664,000
Non-acquired loans | Consumer | Consumer
Loans
Total loans		538,481,000
Non-acquired loans | Other loans
Allowance for loan losses:
Balance at beginning of period	137,000	41,000	305,000
Provision (benefit)		96,000	(264,000)
Balance at end of period		137,000	41,000
Loans collectively evaluated for impairment		137,000	41,000
Loans
Loans collectively evaluated for impairment		13,892,000	9,357,000
Total loans		13,892,000	9,357,000
Non-acquired loans | Other loans | Consumer
Loans
Total loans		13,892,000
Acquired non-credit impaired loans
Allowance for loan losses:
Charge-offs		(2,858,000)	(2,214,000)
Recoveries		547,000	305,000
Provision (benefit)		2,311,000	1,909,000
Loans
Loans collectively evaluated for impairment		1,760,427,000	2,594,826,000
Total loans		1,760,427,000	2,594,826,000
Acquired non-credit impaired loans | Commercial loans
Loans
Total loans		985,780,000
Acquired non-credit impaired loans | Consumer
Loans
Total loans		774,647,000
Acquired non-credit impaired loans | Real estate | Consumer
Loans
Total loans		685,163,000
Acquired non-credit impaired loans | Construction and land development
Allowance for loan losses:
Charge-offs		(44,000)	(107,000)
Recoveries		3,000	8,000
Provision (benefit)		41,000	99,000
Loans
Loans collectively evaluated for impairment		33,569,000	165,070,000
Total loans		33,569,000	165,070,000
Acquired non-credit impaired loans | Construction and land development | Commercial loans
Loans
Total loans		33,569,000
Acquired non-credit impaired loans | Commercial non-owner occupied
Loans
Loans collectively evaluated for impairment		447,441,000	679,253,000
Total loans		447,441,000	679,253,000
Acquired non-credit impaired loans | Commercial non-owner occupied | Commercial loans
Loans
Total loans		447,441,000
Acquired non-credit impaired loans | Commercial owner occupied real estate loan
Allowance for loan losses:
Charge-offs		(786,000)	(28,000)
Provision (benefit)		786,000	28,000
Loans
Loans collectively evaluated for impairment		307,193,000	421,841,000
Total loans		307,193,000	421,841,000
Acquired non-credit impaired loans | Commercial owner occupied real estate loan | Commercial loans
Loans
Total loans		307,193,000
Acquired non-credit impaired loans | Consumer Owner Occupied Loans
Allowance for loan losses:
Charge-offs		(6,000)	(70,000)
Recoveries		26,000	64,000
Provision (benefit)		(20,000)	6,000
Loans
Loans collectively evaluated for impairment		496,431,000	628,813,000
Total loans		496,431,000	628,813,000
Acquired non-credit impaired loans | Consumer Owner Occupied Loans | Consumer
Loans
Total loans		496,431,000
Acquired non-credit impaired loans | Home equity loans
Allowance for loan losses:
Charge-offs		(263,000)	(436,000)
Recoveries		206,000	102,000
Provision (benefit)		57,000	334,000
Loans
Loans collectively evaluated for impairment		188,732,000	242,425,000
Total loans		188,732,000	242,425,000
Acquired non-credit impaired loans | Home equity loans | Consumer
Loans
Total loans		188,732,000
Acquired non-credit impaired loans | Commercial and industrial
Allowance for loan losses:
Charge-offs		(1,289,000)	(1,108,000)
Recoveries		190,000	63,000
Provision (benefit)		1,099,000	1,045,000
Loans
Loans collectively evaluated for impairment		101,880,000	212,537,000
Total loans		101,880,000	212,537,000
Acquired non-credit impaired loans | Commercial and industrial | Commercial loans
Loans
Total loans		101,880,000
Acquired non-credit impaired loans | Other income producing property
Allowance for loan losses:
Charge-offs		(26,000)
Recoveries		71,000
Provision (benefit)		(45,000)
Loans
Loans collectively evaluated for impairment		95,697,000	133,110,000
Total loans		95,697,000	133,110,000
Acquired non-credit impaired loans | Other income producing property | Commercial loans
Loans
Total loans		95,697,000
Acquired non-credit impaired loans | Consumer
Allowance for loan losses:
Charge-offs		(444,000)	(465,000)
Recoveries		51,000	68,000
Provision (benefit)		393,000	397,000
Loans
Loans collectively evaluated for impairment		89,484,000	111,777,000
Total loans		89,484,000	111,777,000
Acquired non-credit impaired loans | Consumer | Consumer
Loans
Total loans		89,484,000
Acquired credit impaired loans
Allowance for loan losses:
Balance at beginning of period	5,064,000	4,604,000	4,627,000
Provision (benefit)		1,183,000	1,111,000
Reduction due to loan removals		(723,000)	(1,134,000)
Balance at end of period		5,064,000	4,604,000
Loans collectively evaluated for impairment		5,064,000	4,604,000
Loans
Loans collectively evaluated for impairment		361,846,000	489,723,000
Total loans		361,846,000	489,723,000
Acquired credit impaired loans | Real estate | Commercial loans
Allowance for loan losses:
Balance at beginning of period	1,377,000	801,000	288,000
Provision (benefit)		577,000	532,000
Reduction due to loan removals		(1,000)	(19,000)
Balance at end of period		1,377,000	801,000
Loans collectively evaluated for impairment		1,377,000	801,000
Loans
Loans collectively evaluated for impairment		130,938,000	196,764,000
Total loans		130,938,000	196,764,000
Acquired credit impaired loans | Real estate | Consumer
Allowance for loan losses:
Balance at beginning of period	2,555,000	2,246,000	3,553,000
Provision (benefit)		716,000	(892,000)
Reduction due to loan removals		(407,000)	(415,000)
Balance at end of period		2,555,000	2,246,000
Loans collectively evaluated for impairment		2,555,000	2,246,000
Loans
Loans collectively evaluated for impairment		163,359,000	207,482,000
Total loans		163,359,000	207,482,000
Acquired credit impaired loans | Construction and land development
Allowance for loan losses:
Balance at beginning of period	569,000	717,000	180,000
Provision (benefit)		(148,000)	657,000
Reduction due to loan removals			(120,000)
Balance at end of period		569,000	717,000
Loans collectively evaluated for impairment		569,000	717,000
Loans
Loans collectively evaluated for impairment		25,032,000	32,942,000
Total loans		25,032,000	32,942,000
Acquired credit impaired loans | Construction and land development | Commercial loans
Loans
Total loans		25,032,000
Acquired credit impaired loans | Commercial and industrial
Allowance for loan losses:
Balance at beginning of period	24,000	79,000	145,000
Provision (benefit)		260,000	511,000
Reduction due to loan removals		(315,000)	(577,000)
Balance at end of period		24,000	79,000
Loans collectively evaluated for impairment		24,000	79,000
Loans
Loans collectively evaluated for impairment		7,029,000	10,043,000
Total loans		7,029,000	10,043,000
Acquired credit impaired loans | Commercial and industrial | Commercial loans
Loans
Total loans		7,029,000
Acquired credit impaired loans | Commercial and industrial | Consumer
Loans
Total loans		7,029,000
Acquired credit impaired loans | Consumer
Allowance for loan losses:
Balance at beginning of period	$ 539,000	761,000	461,000
Provision (benefit)		(222,000)	303,000
Reduction due to loan removals			(3,000)
Balance at end of period		539,000	761,000
Loans collectively evaluated for impairment		539,000	761,000
Loans
Loans collectively evaluated for impairment		35,488,000	42,492,000
Total loans		35,488,000	$ 42,492,000
Acquired credit impaired loans | Consumer | Consumer
Loans
Total loans		$ 35,488,000

X

- Definition

Amount of reduction due to removal of financing receivable, charged against allowance for credit loss.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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The balance of financing receivables that were individually evaluated for impairment.

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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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