Acquisitions - Acquisition date fair value of purchased assets and assumed liabilities and supplementary information (Details) - USD ($) $ in Thousands	Jan. 01, 2022	Oct. 01, 2021	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Consideration transferred
Goodwill			$ 751,174		$ 452,007	$ 367,809
Reliant
Assets
Cash and cash equivalents	$ 62,867
Debt securities	249,107
Loans held for sale	116,406
Loans	2,320,737
Premises and equipment	35,631
BOLI	78,170
Accrued interest receivable	12,027
Net deferred tax asset	5,793
Core deposit intangible	14,500
Other assets	59,768
Total assets acquired	2,955,006
Liabilities
Deposits	2,504,823
Short-term borrowings	27,000
Long-term debt	76,730			$ 76,700
Other liabilities	48,620
Total liabilities assumed	2,657,173
Total identifiable net assets	297,833
Consideration transferred
Cash	624
Common stock issued	595,581
Options converted	795
Total fair value of consideration transferred	597,000
Goodwill	299,167
Non-PCD loans:
Fair value	2,078,306
Gross contractual amounts receivable	2,355,205
Estimate of contractual cash flows not expected to be collected	25,990
Reliant | Purchase loans
PCD loans:
Par value	258,462
ACL at acquisition	(12,737)
Non-credit discount	(3,294)
Purchase price	$ 242,431
Aquesta
Assets
Cash and cash equivalents		$ 153,091
Debt securities		60,762
Loans		498,312
Premises and equipment		18,112
BOLI		12,540
Accrued interest receivable		1,419
Net deferred tax asset		2,129
Core deposit intangible		2,030
Other assets		7,553
Total assets acquired		755,948
Liabilities
Deposits		657,724
FHLB advances		24,509
Other liabilities		12,084
Total liabilities assumed		694,317
Total identifiable net assets		61,631
Consideration transferred
Cash		40,542
Common stock issued		$ 89,646
Common stock issued (in shares)		2,731,435
Option and warrant equity instruments converted		$ 1,478
Total fair value of consideration transferred		131,666
Goodwill		70,035
Non-PCD loans:
Fair value		426,969
Gross contractual amounts receivable		482,737
Estimate of contractual cash flows not expected to be collected		3,399
Aquesta | Purchase loans
PCD loans:
Par value		75,579
ACL at acquisition		(3,544)
Non-credit discount		(692)
Purchase price		$ 71,343