Regulatory Capital (Details) $ in Thousands	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Regulatory Capital Requirements under Banking Regulations [Abstract]
Capital adequacy, minimum, common equity Tier 1	0.0700
Capital adequacy, minimum, Tier 1 risk-based capital	0.0850
Capital adequacy, minimum, total risk-based capital	0.1050
Capital adequacy, minimum, leverage ratios	0.0400
Well capitalized, minimum, common equity Tier 1	0.0650
Well capitalized, minimum, Tier 1 risk-based capital	0.0800
Well capitalized, minimum, total risk-based capital	0.1000
Well capitalized, minimum, leverage ratios	0.0500
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity	$ 501,578	$ 363,140	$ 361,638	$ 364,285	$ 357,221	$ 352,777	$ 351,864	$ 350,693
Goodwill	(63,266)			(63,266)
Core deposit intangible (3)	(37,507)			(5,547)
DTAs that arise from net operating loss and tax credit carry forwards	(11,959)			0
AOCI (gains) losses	10,109			9,021
Common Equity Tier 1 Capital	398,955			304,493
TRUPs	29,079			18,398
Tier 1 Capital	428,034			322,891
Allowable reserve for credit losses and other Tier 2 adjustments	58,190			16,855
Subordinated debt	42,956			24,674
Total Capital	529,180			364,420
Risk-Weighted Assets ("RWA")	4,701,443			2,619,400
Average Assets ("AA")	$ 5,671,496			$ 3,390,516
Common Tier 1 Capital to RWA	0.0700
Common Tier 1 Capital to RWA	0.0849			0.1162
Tier 1 Capital to RWA	0.0850
Tier 1 Capital to RWA	0.0910			0.1233
Total Capital to RWA	0.1050
Total Capital to RWA	0.1126			0.1391
Tier 1 Capital to AA (Leverage) (2)	0.0755			0.0952
The Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity	$ 562,788			$ 395,594
Goodwill	(63,266)			(63,266)
Core deposit intangible (3)	(37,507)			(5,547)
DTAs that arise from net operating loss and tax credit carry forwards	(9,566)			0
AOCI (gains) losses	10,109			9,021
Common Equity Tier 1 Capital	462,558			335,802
TRUPs	0			0
Tier 1 Capital	462,558			335,802
Allowable reserve for credit losses and other Tier 2 adjustments	58,190			16,855
Subordinated debt	0			0
Total Capital	520,748			352,657
Risk-Weighted Assets ("RWA")	4,697,220			2,618,939
Average Assets ("AA")	$ 5,658,990			$ 3,386,771
Common Tier 1 Capital to RWA	0.0985			0.1282
Tier 1 Capital to RWA	0.0985			0.1282
Total Capital to RWA	0.1109			0.1347
Tier 1 Capital to AA (Leverage) (2)	0.0817			0.0992