Regulatory Matters (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum net worth requirement	$ 2,500,000
Percent of outstanding unpaid principal balance	0.25%
Net worth, actual	$ 4,500,000
Dividends	$ 97,000,000	$ 17,600,000
Capital conservation buffer	6.60%	6.00%
Capital [Abstract]
Total capital	$ 934,512,000	$ 876,966,000
Total capital ratio	0.1456	0.1396
Total minimums capital required for capital adequacy	$ 513,394,000	$ 502,463,000
Total minimums capital required for capital adequacy, ratio	0.0800	0.0800
Total capital required to be well capitalized	$ 641,742,000	$ 628,078,000
Total capital required to be well capitalized, ratio	0.1000	0.1000
Tier One Risk Based Capital [Abstract]
Tier 1 capital	$ 862,962,000	$ 798,033,000
Tier 1 capital ratio	0.1345	0.1271
Tier 1 minimums capital required for capital adequacy	$ 385,045,000	$ 376,847,000
Tier 1 minimums capital required for capital adequacy, ratio	0.0600	0.0600
Tier 1 capital required to be well capitalized	$ 513,394,000	$ 502,463,000
Tier 1 capital required to be well capitalized, ratio	0.0800	0.0800
Tier One Leverage Capital [Abstract]
Tier 1 leverage capital	$ 862,962,000	$ 798,033,000
Tier 1 leverage ratio	0.1152	0.1011
Tier 1 leverage minimums capital required for capital adequacy	$ 299,746,000	$ 315,770,000
Tier 1 leverage minimums capital required for capital adequacy, ratio	0.0400	0.0400
Tier 1 leverage capital required to be well capitalized	$ 374,683,000	$ 394,713,000
Tier 1 leverage capital required to be well capitalized, ratio	0.0500	0.0500
Common Equity Tier One Capital [Abstract]
Common equity tier 1 (CET1), amount	$ 801,907,000	$ 736,930,000
Common equity tier 1 (CET1) , ratio	0.1250	0.1173
Common equity tier 1 (CET1) minimums capital required for capital adequacy	$ 288,784,000	$ 282,635,000
Common equity tier 1 (CET1) minimums capital required for capital adequacy, ratio	4.50%	4.50%
Common equity tier 1 (CET1) capital required to be well capitalized	$ 417,133,000	$ 408,251,000
Common equity tier 1 (CET1) capital required to be well capitalized, ratio	6.50%	6.50%
Decrease in regulatory capital	$ 24,700,000
Over One Quarter
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Maximum net worth decline tolerance requirements as percent	25.00%
Over Two Consecutive Quarters
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Maximum net worth decline tolerance requirements as percent	40.00%
The Bank
Capital [Abstract]
Total capital	$ 957,852,000	$ 873,152,000
Total capital ratio	0.1494	0.1391
Total minimums capital required for capital adequacy	$ 512,780,000	$ 502,214,000
Total minimums capital required for capital adequacy, ratio	0.0800	0.0800
Total capital required to be well capitalized	$ 640,976,000	$ 627,768,000
Total capital required to be well capitalized, ratio	0.1000	0.1000
Tier One Risk Based Capital [Abstract]
Tier 1 capital	$ 886,301,000	$ 794,257,000
Tier 1 capital ratio	0.1383	0.1265
Tier 1 minimums capital required for capital adequacy	$ 384,585,000	$ 376,661,000
Tier 1 minimums capital required for capital adequacy, ratio	0.0600	0.0600
Tier 1 capital required to be well capitalized	$ 512,780,000	$ 502,214,000
Tier 1 capital required to be well capitalized, ratio	0.0800	0.0800
Tier One Leverage Capital [Abstract]
Tier 1 leverage capital	$ 886,301,000	$ 794,257,000
Tier 1 leverage ratio	0.1184	0.1007
Tier 1 leverage minimums capital required for capital adequacy	$ 299,466,000	$ 315,569,000
Tier 1 leverage minimums capital required for capital adequacy, ratio	0.0400	0.0400
Tier 1 leverage capital required to be well capitalized	$ 374,332,000	$ 394,461,000
Tier 1 leverage capital required to be well capitalized, ratio	0.0500	0.0500
Common Equity Tier One Capital [Abstract]
Common equity tier 1 (CET1), amount	$ 886,301,000	$ 794,257,000
Common equity tier 1 (CET1) , ratio	0.1383	0.1265
Common equity tier 1 (CET1) minimums capital required for capital adequacy	$ 288,439,000	$ 282,495,000
Common equity tier 1 (CET1) minimums capital required for capital adequacy, ratio	4.50%	4.50%
Common equity tier 1 (CET1) capital required to be well capitalized	$ 416,634,000	$ 408,049,000
Common equity tier 1 (CET1) capital required to be well capitalized, ratio	6.50%	6.50%
Minimum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Net worth decline tolerance actual as percent	40.00%
Capital conservation buffer	2.50%