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Regulatory Requirements - Regulatory Capital Amounts And Ratios Compared To Regulatory Requirements (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
CBLR, amount $ 696,368  
CBLR, ratio 12.93%  
CBLR, for capital adequacy purposes amount $ 457,751  
CBLR, for capital adequacy purposes ratio 8.50%  
CBLR, for well capitalized under prompt corrective action provisions amount $ 457,751  
CBLR, for well capitalized under prompt corrective action provisions ratio 8.50%  
Common Equity Tier 1 Capital (to risk-weighted assets), amount   $ 698,864
Common Equity Tier 1 Capital (to risk-weighted assets), ratio   12.73%
Common Equity Tier 1 Capital (to risk-weighted assets), for capital adequacy purposes amount   $ 439,219
Common Equity Tier 1 Capital (to risk-weighted assets), for capital adequacy purposes ratio 4.50% 8.00%
Common Equity Tier 1 Capital (to risk-weighted assets), for well capitalized under prompt corrective action provisions amount   $ 439,219
Common Equity Tier 1 Capital (to risk-weighted assets), for well capitalized under prompt corrective action provisions ratio 6.50% 8.00%
Subsidiaries    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
CBLR, amount $ 659,522  
CBLR, ratio 12.24%  
CBLR, for capital adequacy purposes amount $ 457,872  
CBLR, for capital adequacy purposes ratio 8.50%  
CBLR, for well capitalized under prompt corrective action provisions amount $ 457,872  
CBLR, for well capitalized under prompt corrective action provisions ratio 8.50%  
Common Equity Tier 1 Capital (to risk-weighted assets), amount   $ 656,324
Common Equity Tier 1 Capital (to risk-weighted assets), ratio   11.96%
Common Equity Tier 1 Capital (to risk-weighted assets), for capital adequacy purposes amount   $ 439,124
Common Equity Tier 1 Capital (to risk-weighted assets), for capital adequacy purposes ratio   8.00%
Common Equity Tier 1 Capital (to risk-weighted assets), for well capitalized under prompt corrective action provisions amount   $ 439,124
Common Equity Tier 1 Capital (to risk-weighted assets), for well capitalized under prompt corrective action provisions ratio   8.00%