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Portfolio Loans - Activity in the allowance for loan losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Activity in the allowance for loan losses
ACL beginning balance	$ 93,943	$ 84,384	$ 101,048	$ 53,748
Provision for credit losses	(1,700)	12,891	(8,496)	30,107
Charged-off	(1,538)	(1,702)	(2,502)	(5,850)
Recoveries	527	473	1,182	1,208
ACL ending balance	95,410	96,046	95,410	96,046
Allowance for loan losses Ending balance attributed to:
Loans individually evaluated for impairment	4,495		4,495		$ 1,625
Loans collectively evaluated for impairment	90,915		90,915		99,423
Ending balance	95,410	96,046	95,410	96,046	101,048
Loans:
Loans individually evaluated for impairment	23,164		23,164		20,246
Loans collectively evaluated for impairment	7,162,486		7,162,486		6,793,931
Ending balance	7,185,650		7,185,650		6,814,177
Day 1 PCD
Activity in the allowance for loan losses
ACL beginning balance	4,178		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	23,025	22,725	23,866	18,291
Provision for credit losses	(1,420)	2,473	(2,084)	8,146
Charged-off	(1,000)	(1,140)	(1,262)	(3,182)
Recoveries	205	88	290	176
ACL ending balance	24,356	24,146	24,356	24,146
Allowance for loan losses Ending balance attributed to:
Loans individually evaluated for impairment	4,470		4,470		1,600
Loans collectively evaluated for impairment	19,886		19,886		22,266
Ending balance	24,356	24,146	24,356	24,146	23,866
Loans:
Loans individually evaluated for impairment	10,585		10,585		8,372
Loans collectively evaluated for impairment	2,043,965		2,043,965		2,006,204
Ending balance	2,054,550		2,054,550		2,014,576
Commercial Loans | Day 1 PCD
Activity in the allowance for loan losses
ACL beginning balance	3,546		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	43,306	35,967	46,230	21,190
Provision for credit losses	(3,390)	6,861	(6,085)	13,387
Charged-off	(317)	(165)	(620)	(1,264)
Recoveries	39	17	113	61
ACL ending balance	39,974	42,680	39,974	42,680
Allowance for loan losses Ending balance attributed to:
Loans collectively evaluated for impairment	39,974		39,974		46,230
Ending balance	39,974	42,680	39,974	42,680	46,230
Loans:
Loans individually evaluated for impairment	8,360		8,360		6,067
Loans collectively evaluated for impairment	2,911,952		2,911,952		2,886,468
Ending balance	2,920,312		2,920,312		2,892,535
Commercial Real Estate Loans | Day 1 PCD
Activity in the allowance for loan losses
ACL beginning balance	336		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	6,879	7,193	8,193	3,204
Provision for credit losses	671	574	(579)	1,463
Charged-off			(209)
Recoveries	49	25	194	171
ACL ending balance	7,599	7,792	7,599	7,792
Allowance for loan losses Ending balance attributed to:
Loans collectively evaluated for impairment	7,599		7,599		8,193
Ending balance	7,599	7,792	7,599	7,792	8,193
Loans:
Loans individually evaluated for impairment	283		283		292
Loans collectively evaluated for impairment	500,316		500,316		461,494
Ending balance	500,599		500,599		461,786
Retail Real Estate
Activity in the allowance for loan losses
ACL beginning balance	19,978	17,454	21,992	10,495
Provision for credit losses	404	2,981	(1,873)	7,018
Charged-off	(157)	(292)	(160)	(1,000)
Recoveries	151	262	417	600
ACL ending balance	20,505	20,405	20,505	20,405
Allowance for loan losses Ending balance attributed to:
Loans individually evaluated for impairment	25		25		25
Loans collectively evaluated for impairment	20,480		20,480		21,967
Ending balance	20,505	20,405	20,505	20,405	21,992
Loans:
Loans individually evaluated for impairment	3,936		3,936		5,515
Loans collectively evaluated for impairment	1,521,874		1,521,874		1,402,337
Ending balance	1,525,810		1,525,810		1,407,852
Retail Real Estate | Day 1 PCD
Activity in the allowance for loan losses
ACL beginning balance	129		129
Allowance for loan losses Ending balance attributed to:
Ending balance					129
Retail Other
Activity in the allowance for loan losses
ACL beginning balance	755	1,045	767	568
Provision for credit losses	2,035	2	2,125	93
Charged-off	(64)	(105)	(251)	(404)
Recoveries	83	81	168	200
ACL ending balance	2,976	1,023	2,976	1,023
Allowance for loan losses Ending balance attributed to:
Loans collectively evaluated for impairment	2,976		2,976		767
Ending balance	2,976	1,023	2,976	1,023	767
Loans:
Loans collectively evaluated for impairment	184,379		184,379		37,428
Ending balance	184,379		184,379		37,428
Retail Other | Day 1 PCD
Activity in the allowance for loan losses
ACL beginning balance	$ 167		$ 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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