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Regulatory Capital - Summary of the Bank's Compliance (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Tier I (leverage) capital:    
Tier i (leverage) capital, capital level, amount $ 694,041 $ 680,749
Tier i (leverage) capital, capital level, percent 9.93% 9.65%
Tier i (leverage) capital, requirement to be well capitalized, amount $ 349,453 $ 352,581
Tier i (leverage) capital, requirement to be well capitalized, percent 5.00% 5.00%
Tier i (leverage) capital, excess, amount $ 344,588 $ 328,168
Tier i (leverage) capital, excess, percent 4.93% 4.65%
Common Equity Tier I risk-based capital:    
Common equity tier i risk-based capital, capital level, amount $ 694,041 $ 680,749
Common equity tier i risk-based capital, capital level, percent 12.88% 13.02%
Common equity tier i risk-based capital, requirement to be well capitalized, amount $ 350,156 $ 339,944
Common equity tier i risk-based capital, requirement to be well capitalized, percent 6.50% 6.50%
Common equity tier i risk-based capital, excess, amount $ 343,885 $ 340,805
Common equity tier i risk-based capital, excess, percent 6.38% 6.52%
Tier I risk-based capital:    
Tier 1 risk-based capital, capital level, amount $ 694,041 $ 680,749
Tier 1 risk-based capital, capital level, percent 12.88% 13.02%
Tier 1 risk-based capital, requirement to be well capitalized, amount $ 430,962 $ 418,393
Tier 1 risk-based capital, requirement to be well capitalized, percent 8.00% 8.00%
Tier 1 risk-based capital, excess, amount $ 263,079 $ 262,356
Tier 1 risk-based capital, excess, percent 4.88% 5.02%
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 729,160 $ 702,500
Total risk-based capital, capital level, percent 13.54% 13.43%
Total risk-based capital, requirement to be well capitalized, amount $ 538,702 $ 522,991
Total risk-based capital, requirement to be well capitalized, percent 10.00% 10.00%
Total risk-based capital, excess, amount $ 190,458 $ 179,509
Total risk-based capital, excess, percent 3.54% 3.43%
Holding Company    
Tier I (leverage) capital:    
Tier i (leverage) capital, capital level, amount $ 630,380 $ 615,500
Tier i (leverage) capital, capital level, percent 9.03% 8.73%
Tier i (leverage) capital, requirement to be well capitalized, amount $ 349,174 $ 352,581
Tier i (leverage) capital, requirement to be well capitalized, percent 5.00% 5.00%
Tier i (leverage) capital, excess, amount $ 281,206 $ 262,919
Tier i (leverage) capital, excess, percent 4.03% 3.73%
Common Equity Tier I risk-based capital:    
Common equity tier i risk-based capital, capital level, amount $ 593,344 $ 572,651
Common equity tier i risk-based capital, capital level, percent 11.02% 10.95%
Common equity tier i risk-based capital, requirement to be well capitalized, amount $ 349,826 $ 339,929
Common equity tier i risk-based capital, requirement to be well capitalized, percent 6.50% 6.50%
Common equity tier i risk-based capital, excess, amount $ 243,518 $ 232,722
Common equity tier i risk-based capital, excess, percent 4.52% 4.45%
Tier I risk-based capital:    
Tier 1 risk-based capital, capital level, amount $ 630,380 $ 615,500
Tier 1 risk-based capital, capital level, percent 11.71% 11.77%
Tier 1 risk-based capital, requirement to be well capitalized, amount $ 430,555 $ 418,374
Tier 1 risk-based capital, requirement to be well capitalized, percent 8.00% 8.00%
Tier 1 risk-based capital, excess, amount $ 199,825 $ 197,126
Tier 1 risk-based capital, excess, percent 3.71% 3.77%
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 740,499 $ 712,251
Total risk-based capital, capital level, percent 13.76% 13.62%
Total risk-based capital, requirement to be well capitalized, amount $ 538,194 $ 522,967
Total risk-based capital, requirement to be well capitalized, percent 10.00% 10.00%
Total risk-based capital, excess, amount $ 202,305 $ 189,284
Total risk-based capital, excess, percent 3.76% 3.62%