Acquisitions - Acquisition date fair value of purchased assets and assumed liabilities and supplementary information (Details) - USD ($) $ in Thousands	Oct. 01, 2021	Jul. 01, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Consideration transferred
Goodwill			$ 452,007	$ 367,809	$ 327,425
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 and long-term debt	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
PCD loans:
Purchase price	71,343
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)
Three Shores
Assets
Cash and cash equivalents		$ 219,807
Debt securities		381,740
Loans		1,427,966
Premises and equipment		1,584
Accrued interest receivable		7,681
Derivative assets		11,800
Net deferred tax asset		15,061
Core deposit intangible		3,360
Other assets		65,340
Total assets acquired		2,134,339
Liabilities
Deposits		1,802,694
FHLB advances and long-term debt		144,121
Derivative liabilities		12,165
Other liabilities		28,046
Total liabilities assumed		1,987,026
Total identifiable net assets		147,313
Consideration transferred
Cash		24,108
Common stock issued		$ 163,589
Common stock issued (in shares)		8,130,633
Total fair value of consideration transferred		$ 187,697
Goodwill		40,384
Non-PCD loans:
Fair value		1,164,675
Gross contractual amounts receivable		1,358,793
Estimate of contractual cash flows not expected to be collected		76,503
Three Shores | Purchase loans
PCD loans:
Par Value		283,137
ACL at acquisition		(11,152)
Non-credit discount		(8,694)
Purchase price		$ 263,291