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Portfolio Loans - Activity in the allowance for loan losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Activity in the allowance for loan losses
ACL beginning balance	$ 95,410	$ 96,046	$ 101,048	$ 53,748
Provision for credit losses	(1,869)	5,549	(10,365)	35,656
Charged-off	(1,208)	(3,397)	(3,711)	(9,247)
Recoveries	469	643	1,652	1,851
ACL ending balance	92,802	98,841	92,802	98,841
Allowance for loan losses Ending balance attributed to:
Loans individually evaluated for impairment	4,475		4,475		$ 1,625
Loans collectively evaluated for impairment	88,327		88,327		99,423
Ending balance	92,802	98,841	92,802	98,841	101,048
Loans:
Loans individually evaluated for impairment	20,366		20,366		20,246
Loans collectively evaluated for impairment	7,130,269		7,130,269		6,793,931
Ending balance	7,150,635		7,150,635		6,814,177
Day 1 PCD
Activity in the allowance for loan losses
ACL beginning balance			4,178
Allowance for loan losses Ending balance attributed to:
Ending balance					4,178
Commercial Loans
Activity in the allowance for loan losses
ACL beginning balance	24,356	24,146	23,866	18,291
Provision for credit losses	657	2,593	(1,428)	10,739
Charged-off	(764)	(2,500)	(2,026)	(5,682)
Recoveries	157	124	448	300
ACL ending balance	24,406	24,363	24,406	24,363
Allowance for loan losses Ending balance attributed to:
Loans individually evaluated for impairment	4,450		4,450		1,600
Loans collectively evaluated for impairment	19,956		19,956		22,266
Ending balance	24,406	24,363	24,406	24,363	23,866
Loans:
Loans individually evaluated for impairment	10,206		10,206		8,372
Loans collectively evaluated for impairment	1,921,657		1,921,657		2,006,204
Ending balance	1,931,863		1,931,863		2,014,576
Commercial Loans | Day 1 PCD
Activity in the allowance for loan losses
ACL beginning balance			3,546
Allowance for loan losses Ending balance attributed to:
Ending balance					3,546
Commercial Real Estate Loans
Activity in the allowance for loan losses
ACL beginning balance	39,974	42,680	46,230	21,190
Provision for credit losses	(25)	3,703	(6,109)	17,090
Charged-off	(191)	(569)	(812)	(1,833)
Recoveries	73	103	186	164
ACL ending balance	39,831	45,917	39,831	45,917
Allowance for loan losses Ending balance attributed to:
Loans collectively evaluated for impairment	39,831		39,831		46,230
Ending balance	39,831	45,917	39,831	45,917	46,230
Loans:
Loans individually evaluated for impairment	6,222		6,222		6,067
Loans collectively evaluated for impairment	3,062,400		3,062,400		2,886,468
Ending balance	3,068,622		3,068,622		2,892,535
Commercial Real Estate Loans | Day 1 PCD
Activity in the allowance for loan losses
ACL beginning balance			336
Allowance for loan losses Ending balance attributed to:
Ending balance					336
Real Estate Construction
Activity in the allowance for loan losses
ACL beginning balance	7,599	7,792	8,193	3,204
Provision for credit losses	(1,503)	(381)	(2,082)	1,082
Charged-off		(18)	(209)	(18)
Recoveries	25	26	219	197
ACL ending balance	6,121	7,419	6,121	7,419
Allowance for loan losses Ending balance attributed to:
Loans collectively evaluated for impairment	6,121		6,121		8,193
Ending balance	6,121	7,419	6,121	7,419	8,193
Loans:
Loans individually evaluated for impairment	276		276		292
Loans collectively evaluated for impairment	430,581		430,581		461,494
Ending balance	430,857		430,857		461,786
Retail Real Estate
Activity in the allowance for loan losses
ACL beginning balance	20,505	20,405	21,992	10,495
Provision for credit losses	(1,155)	(383)	(3,028)	6,635
Charged-off	(155)	(139)	(315)	(1,139)
Recoveries	157	301	574	901
ACL ending balance	19,352	20,184	19,352	20,184
Allowance for loan losses Ending balance attributed to:
Loans individually evaluated for impairment	25		25		25
Loans collectively evaluated for impairment	19,327		19,327		21,967
Ending balance	19,352	20,184	19,352	20,184	21,992
Loans:
Loans individually evaluated for impairment	3,662		3,662		5,515
Loans collectively evaluated for impairment	1,509,222		1,509,222		1,402,337
Ending balance	1,512,884		1,512,884		1,407,852
Retail Real Estate | Day 1 PCD
Activity in the allowance for loan losses
ACL beginning balance			129
Allowance for loan losses Ending balance attributed to:
Ending balance					129
Retail Other
Activity in the allowance for loan losses
ACL beginning balance	2,976	1,023	767	568
Provision for credit losses	157	17	2,282	110
Charged-off	(98)	(171)	(349)	(575)
Recoveries	57	89	225	289
ACL ending balance	3,092	958	3,092	958
Allowance for loan losses Ending balance attributed to:
Loans collectively evaluated for impairment	3,092		3,092		767
Ending balance	3,092	958	3,092	958	767
Loans:
Loans collectively evaluated for impairment	206,409		206,409		37,428
Ending balance	$ 206,409		206,409		37,428
Retail Other | Day 1 PCD
Activity in the allowance for loan losses
ACL beginning balance			$ 167
Allowance for loan losses Ending balance attributed to:
Ending balance					$ 167
Cumulative Effect, Period of Adoption, Adjustment
Activity in the allowance for loan losses
ACL ending balance		16,833		16,833
Allowance for loan losses Ending balance attributed to:
Ending balance		16,833		16,833
Cumulative Effect, Period of Adoption, Adjustment | Commercial Loans
Activity in the allowance for loan losses
ACL ending balance		715		715
Allowance for loan losses Ending balance attributed to:
Ending balance		715		715
Cumulative Effect, Period of Adoption, Adjustment | Commercial Real Estate Loans
Activity in the allowance for loan losses
ACL ending balance		9,306		9,306
Allowance for loan losses Ending balance attributed to:
Ending balance		9,306		9,306
Cumulative Effect, Period of Adoption, Adjustment | Real Estate Construction
Activity in the allowance for loan losses
ACL ending balance		2,954		2,954
Allowance for loan losses Ending balance attributed to:
Ending balance		2,954		2,954
Cumulative Effect, Period of Adoption, Adjustment | Retail Real Estate
Activity in the allowance for loan losses
ACL ending balance		3,292		3,292
Allowance for loan losses Ending balance attributed to:
Ending balance		3,292		3,292
Cumulative Effect, Period of Adoption, Adjustment | Retail Other
Activity in the allowance for loan losses
ACL ending balance		566		566
Allowance for loan losses Ending balance attributed to:
Ending balance		$ 566		$ 566

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