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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Mar. 31, 2020
Allowance for loan losses:          
Balance at beginning of period $ 457,309,000 $ 56,927,000      
Charge-offs (16,899,000) (14,602,000)      
Recoveries 13,800,000 11,777,000      
(Recovery) provision (152,403,000) 89,923,000      
Balance at end of period 301,807,000 457,309,000 $ 56,927,000    
Loans individually evaluated for impairment 2,464,000 1,249,000      
Loans collectively evaluated for impairment 292,210,000 415,929,000      
Loans          
Loans individually evaluated for impairment       $ 1,000,000.0 $ 500,000
Total loans 23,928,166,000 24,664,134,000      
Construction and land development | Commercial loans          
Loans          
Total loans 2,029,216,000 1,890,846,000      
Commercial non-owner occupied | Commercial loans          
Loans          
Total loans 6,735,699,000 6,152,246,000      
Consumer Owner Occupied Loans | Consumer portfolio loans          
Loans          
Total loans 3,638,364,000 3,682,667,000      
Home equity loans | Consumer portfolio loans          
Loans          
Total loans 1,168,594,000 1,292,141,000      
Commercial and industrial | Commercial loans          
Loans          
Total loans 3,761,133,000 5,046,310,000      
Other income producing property | Commercial loans          
Loans          
Total loans 696,804,000 854,900,000      
Consumer loans | Consumer portfolio loans          
Loans          
Total loans 904,657,000 894,334,000      
Other loans | Consumer portfolio loans          
Loans          
Total loans 23,583,000 17,993,000      
Non-acquired loans          
Allowance for loan losses:          
Balance at beginning of period   56,927,000 51,194,000    
Charge-offs     (6,917,000)    
Recoveries     3,367,000    
(Recovery) provision     9,283,000    
Balance at end of period     56,927,000    
Loans individually evaluated for impairment     1,346,000    
Loans collectively evaluated for impairment     55,581,000    
Loans          
Loans individually evaluated for impairment     58,532,000    
Loans collectively evaluated for impairment     9,194,299,000    
Total loans     9,252,831,000    
Non-acquired loans | Construction and land development          
Allowance for loan losses:          
Balance at beginning of period   6,104,000 5,682,000    
Charge-offs     (78,000)    
Recoveries     1,016,000    
(Recovery) provision     (516,000)    
Balance at end of period     6,104,000    
Loans individually evaluated for impairment     617,000    
Loans collectively evaluated for impairment     5,487,000    
Loans          
Loans individually evaluated for impairment     35,201,000    
Loans collectively evaluated for impairment     933,159,000    
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    
Charge-offs     (3,000)    
Recoveries     76,000    
(Recovery) provision     1,872,000    
Balance at end of period     10,699,000    
Loans collectively evaluated for impairment     10,699,000    
Loans          
Loans individually evaluated for impairment     379,000    
Loans collectively evaluated for impairment     1,810,759,000    
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    
Charge-offs     (87,000)    
Recoveries     174,000    
(Recovery) provision     1,125,000    
Balance at end of period     10,581,000    
Loans individually evaluated for impairment     24,000    
Loans collectively evaluated for impairment     10,557,000    
Loans          
Loans individually evaluated for impairment     6,575,000    
Loans collectively evaluated for impairment     1,777,442,000    
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    
Charge-offs     (50,000)    
Recoveries     213,000    
(Recovery) provision     520,000    
Balance at end of period     12,596,000    
Loans individually evaluated for impairment     102,000    
Loans collectively evaluated for impairment     12,494,000    
Loans          
Loans individually evaluated for impairment     5,141,000    
Loans collectively evaluated for impairment     2,113,698,000    
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    
Charge-offs     (203,000)    
Recoveries     265,000    
(Recovery) provision     (308,000)    
Balance at end of period     3,188,000    
Loans individually evaluated for impairment     132,000    
Loans collectively evaluated for impairment     3,056,000    
Loans          
Loans individually evaluated for impairment     2,461,000    
Loans collectively evaluated for impairment     516,167,000    
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    
Charge-offs     (622,000)    
Recoveries     351,000    
(Recovery) provision     1,156,000    
Balance at end of period     8,339,000    
Loans individually evaluated for impairment     366,000    
Loans collectively evaluated for impairment     7,973,000    
Loans          
Loans individually evaluated for impairment     6,578,000    
Loans collectively evaluated for impairment     1,274,281,000    
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    
Charge-offs     (31,000)    
Recoveries     94,000    
(Recovery) provision     (173,000)    
Balance at end of period     1,336,000    
Loans individually evaluated for impairment     50,000    
Loans collectively evaluated for impairment     1,286,000    
Loans          
Loans individually evaluated for impairment     2,024,000    
Loans collectively evaluated for impairment     216,593,000    
Total loans     218,617,000    
Non-acquired loans | Consumer loans          
Allowance for loan losses:          
Balance at beginning of period   3,947,000 3,101,000    
Charge-offs     (5,843,000)    
Recoveries     1,178,000    
(Recovery) provision     5,511,000    
Balance at end of period     3,947,000    
Loans individually evaluated for impairment     55,000    
Loans collectively evaluated for impairment     3,892,000    
Loans          
Loans individually evaluated for impairment     173,000    
Loans collectively evaluated for impairment     538,308,000    
Total loans     538,481,000    
Non-acquired loans | Other loans          
Allowance for loan losses:          
Balance at beginning of period   137,000 41,000    
(Recovery) provision     96,000    
Balance at end of period     137,000    
Loans collectively evaluated for impairment     137,000    
Loans          
Loans collectively evaluated for impairment     13,892,000    
Total loans     13,892,000    
Acquired non-credit impaired loans          
Allowance for loan losses:          
Charge-offs     (2,858,000)    
Recoveries     547,000    
(Recovery) provision     2,311,000    
Loans          
Loans collectively evaluated for impairment     1,760,427,000    
Total loans     1,760,427,000    
Acquired non-credit impaired loans | Construction and land development          
Allowance for loan losses:          
Charge-offs     (44,000)    
Recoveries     3,000    
(Recovery) provision     41,000    
Loans          
Loans collectively evaluated for impairment     33,569,000    
Total loans     33,569,000    
Acquired non-credit impaired loans | Commercial non-owner occupied          
Loans          
Loans collectively evaluated for impairment     447,441,000    
Total loans     447,441,000    
Acquired non-credit impaired loans | Commercial owner occupied real estate loan          
Allowance for loan losses:          
Charge-offs     (786,000)    
(Recovery) provision     786,000    
Loans          
Loans collectively evaluated for impairment     307,193,000    
Total loans     307,193,000    
Acquired non-credit impaired loans | Consumer Owner Occupied Loans          
Allowance for loan losses:          
Charge-offs     (6,000)    
Recoveries     26,000    
(Recovery) provision     (20,000)    
Loans          
Loans collectively evaluated for impairment     496,431,000    
Total loans     496,431,000    
Acquired non-credit impaired loans | Home equity loans          
Allowance for loan losses:          
Charge-offs     (263,000)    
Recoveries     206,000    
(Recovery) provision     57,000    
Loans          
Loans collectively evaluated for impairment     188,732,000    
Total loans     188,732,000    
Acquired non-credit impaired loans | Commercial and industrial          
Allowance for loan losses:          
Charge-offs     (1,289,000)    
Recoveries     190,000    
(Recovery) provision     1,099,000    
Loans          
Loans collectively evaluated for impairment     101,880,000    
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    
(Recovery) provision     (45,000)    
Loans          
Loans collectively evaluated for impairment     95,697,000    
Total loans     95,697,000    
Acquired non-credit impaired loans | Consumer loans          
Allowance for loan losses:          
Charge-offs     (444,000)    
Recoveries     51,000    
(Recovery) provision     393,000    
Loans          
Loans collectively evaluated for impairment     89,484,000    
Total loans     89,484,000    
Acquired credit impaired loans          
Allowance for loan losses:          
Balance at beginning of period 5,064,000   4,604,000    
(Recovery) provision   1,183,000      
Reduction due to loan removals   (723,000)      
Balance at end of period   5,064,000      
Loans collectively evaluated for impairment   5,064,000      
Loans          
Loans collectively evaluated for impairment   361,846,000      
Total loans   361,846,000      
Acquired credit impaired loans | Real estate | Commercial loans          
Allowance for loan losses:          
Balance at beginning of period 1,377,000   801,000    
(Recovery) provision   577,000      
Reduction due to loan removals   (1,000)      
Balance at end of period   1,377,000      
Loans collectively evaluated for impairment   1,377,000      
Loans          
Loans collectively evaluated for impairment   130,938,000      
Total loans   130,938,000      
Acquired credit impaired loans | Real estate | Consumer portfolio loans          
Allowance for loan losses:          
Balance at beginning of period 2,555,000   2,246,000    
(Recovery) provision   716,000      
Reduction due to loan removals   (407,000)      
Balance at end of period   2,555,000      
Loans collectively evaluated for impairment   2,555,000      
Loans          
Loans collectively evaluated for impairment   163,359,000      
Total loans   163,359,000      
Acquired credit impaired loans | Construction and land development          
Allowance for loan losses:          
Balance at beginning of period 569,000   717,000    
(Recovery) provision   (148,000)      
Balance at end of period   569,000      
Loans collectively evaluated for impairment   569,000      
Loans          
Loans collectively evaluated for impairment   25,032,000      
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    
(Recovery) provision   260,000      
Reduction due to loan removals   (315,000)      
Balance at end of period   24,000      
Loans collectively evaluated for impairment   24,000      
Loans          
Loans collectively evaluated for impairment   7,029,000      
Total loans   7,029,000      
Acquired credit impaired loans | Consumer loans          
Allowance for loan losses:          
Balance at beginning of period $ 539,000   $ 761,000    
(Recovery) provision   (222,000)      
Balance at end of period   539,000      
Loans collectively evaluated for impairment   539,000      
Loans          
Loans collectively evaluated for impairment   35,488,000      
Total loans   $ 35,488,000