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Regulatory Capital - Summary of the Bank's Compliance (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Tier I (leverage) capital:    
Tier i (leverage) capital, capital level, amount $ 676,267 $ 680,749
Tier i (leverage) capital, capital level, percent 9.51% 9.65%
Tier i (leverage) capital, requirement to be well capitalized, amount $ 355,552 $ 352,581
Tier i (leverage) capital, requirement to be well capitalized, percent 5.00% 5.00%
Tier i (leverage) capital, excess, amount $ 320,715 $ 328,168
Tier i (leverage) capital, excess, percent 4.51% 4.65%
Common Equity Tier I risk-based capital:    
Common equity tier i risk-based capital, capital level, amount $ 676,267 $ 680,749
Common equity tier i risk-based capital, capital level, percent 12.48% 13.02%
Common equity tier i risk-based capital, requirement to be well capitalized, amount $ 352,240 $ 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 $ 324,027 $ 340,805
Common equity tier i risk-based capital, excess, percent 5.98% 6.52%
Tier I risk-based capital:    
Tier 1 risk-based capital, capital level, amount $ 676,267 $ 680,749
Tier 1 risk-based capital, capital level, percent 12.48% 13.02%
Tier 1 risk-based capital, requirement to be well capitalized, amount $ 433,526 $ 418,393
Tier 1 risk-based capital, requirement to be well capitalized, percent 8.00% 8.00%
Tier 1 risk-based capital, excess, amount $ 242,741 $ 262,356
Tier 1 risk-based capital, excess, percent 4.48% 5.02%
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 703,130 $ 702,500
Total risk-based capital, capital level, percent 12.98% 13.43%
Total risk-based capital, requirement to be well capitalized, amount $ 541,908 $ 522,991
Total risk-based capital, requirement to be well capitalized, percent 10.00% 10.00%
Total risk-based capital, excess, amount $ 161,222 $ 179,509
Total risk-based capital, excess, percent 2.98% 3.43%
Holding Company    
Tier I (leverage) capital:    
Tier i (leverage) capital, capital level, amount $ 610,898 $ 615,500
Tier i (leverage) capital, capital level, percent 8.59% 8.73%
Tier i (leverage) capital, requirement to be well capitalized, amount $ 355,470 $ 352,581
Tier i (leverage) capital, requirement to be well capitalized, percent 5.00% 5.00%
Tier i (leverage) capital, excess, amount $ 255,428 $ 262,919
Tier i (leverage) capital, excess, percent 3.59% 3.73%
Common Equity Tier I risk-based capital:    
Common equity tier i risk-based capital, capital level, amount $ 567,306 $ 572,651
Common equity tier i risk-based capital, capital level, percent 10.47% 10.95%
Common equity tier i risk-based capital, requirement to be well capitalized, amount $ 352,184 $ 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 $ 215,122 $ 232,722
Common equity tier i risk-based capital, excess, percent 3.97% 4.45%
Tier I risk-based capital:    
Tier 1 risk-based capital, capital level, amount $ 610,898 $ 615,500
Tier 1 risk-based capital, capital level, percent 11.28% 11.77%
Tier 1 risk-based capital, requirement to be well capitalized, amount $ 433,458 $ 418,374
Tier 1 risk-based capital, requirement to be well capitalized, percent 8.00% 8.00%
Tier 1 risk-based capital, excess, amount $ 177,440 $ 197,126
Tier 1 risk-based capital, excess, percent 3.28% 3.77%
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 712,761 $ 712,251
Total risk-based capital, capital level, percent 13.16% 13.62%
Total risk-based capital, requirement to be well capitalized, amount $ 541,822 $ 522,967
Total risk-based capital, requirement to be well capitalized, percent 10.00% 10.00%
Total risk-based capital, excess, amount $ 170,939 $ 189,284
Total risk-based capital, excess, percent 3.16% 3.62%