Regulatory Capital (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
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	$ 515,228	$ 511,135	$ 361,638	$ 364,285
Goodwill	(61,523)	(63,266)
Core deposit intangible	(34,235)	(38,069)
DTAs that arise from net operating loss and tax credit carry forwards	(5,858)	(8,977)
AOCI losses	8,058	7,494
Common Equity Tier 1 Capital	421,670	408,317
TRUPs	29,237	29,158
Tier 1 Capital	450,907	437,475
Allowable reserve for credit losses and other Tier 2 adjustments	58,428	58,586
Subordinated debt, net	43,322	43,139
Tier 2 Capital	552,657	539,200
Risk-Weighted Assets ("RWA")	4,729,930	4,697,504
Average Assets ("AA")	$ 5,684,150	$ 5,649,116
Common Tier 1 Capital to RWA	0.0700
Common Tier 1 Capital to RWA	0.0891	0.0869
Tier 1 Capital to RWA	0.0850
Tier 1 Capital to RWA	0.0953	0.0931
Tier 2 Capital to RWA	0.1050
Tier 2 Capital to RWA	0.1168	0.1148
Tier 1 Capital to AA (Leverage) (2)	0.0793	0.0774
The Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity	$ 579,520	$ 570,100
Goodwill	(61,523)	(63,266)
Core deposit intangible	(34,235)	(38,069)
DTAs that arise from net operating loss and tax credit carry forwards	(4,326)	(6,059)
AOCI losses	8,058	7,494
Common Equity Tier 1 Capital	487,494	470,200
TRUPs	0	0
Tier 1 Capital	487,494	470,200
Allowable reserve for credit losses and other Tier 2 adjustments	58,428	58,586
Subordinated debt, net	0	0
Tier 2 Capital	545,922	528,786
Risk-Weighted Assets ("RWA")	4,723,872	4,693,009
Average Assets ("AA")	$ 5,679,282	$ 5,644,930
Common Tier 1 Capital to RWA	0.1032	0.1002
Tier 1 Capital to RWA	0.1032	0.1002
Tier 2 Capital to RWA	0.1156	0.1127
Tier 1 Capital to AA (Leverage) (2)	0.0858	0.0833