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CAPITAL - Risk-Based Capital (Details) $ in Thousands | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Capital Conservation Buffer-Fully Phased-In | 2.50% |
Banking Regulation, Total Risk-Based Capital, Excess, Actual | $ 419,800 |
Banking Regulation, Risk-Based Information [Abstract] |  |
Banking Regulation, Common Equity Tier One Risk-Based Capital, Actual | $ 1,262,789 | $ 1,325,922
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Actual | 0.1084 | 0.1182
Banking Regulation, Common Equity Tier One Risk-Based Capital, Capital Adequacy, Minimum | $ 815,197 | $ 785,338
Common Equity Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets | 0.0700 | 0.0700
Banking Regulation, Tier One Risk-Based Capital [Abstract] |  |
Banking Regulation, Tier One Risk-Based Capital, Actual | $ 1,306,571 | $ 1,368,818
Banking Regulation, Tier One Risk-Based Capital Ratio, Actual | 0.1122 | 0.1220
Banking Regulation, Tier One Risk-Based Capital, Capital Adequacy, Minimum | $ 989,882 | $ 953,625
Banking Regulation, Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum | 0.085 | 0.0850
Banking Regulation, Total Capital [Abstract] |  |
Banking Regulation, Total Capital, Actual | $ 1,642,549 | $ 1,744,802
Banking Regulation, Total Risk-Based Capital Ratio, Actual | 0.1410 | 0.1555
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum | $ 1,222,795 | $ 1,178,007
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum | 0.1050 | 0.1050
Banking Regulation, Tier One Leverage Capital [Abstract] |  |
Banking Regulation, Tier One Leverage Capital, Actual | $ 1,306,571 | $ 1,368,818
Banking Regulation, Tier One Leverage Capital Ratio, Actual | 0.0870 | 0.0955
Banking Regulation, Tier One Leverage Capital, Capital Adequacy, Minimum | $ 600,410 | $ 573,526
Banking Regulation, Tier One Leverage Capital Ratio, Capital Adequacy, Minimum | 0.0400 | 0.0400
Subsidiaries [Member] |  |
Banking Regulation, Risk-Based Information [Abstract] |  |
Banking Regulation, Common Equity Tier One Risk-Based Capital, Actual | $ 1,513,175 | $ 1,452,403
Banking Regulation, Common Equity Tier One Risk-Based Capital Ratio, Actual | 0.1301 | 0.1295
Banking Regulation, Common Equity Tier One Risk-Based Capital, Capital Adequacy, Minimum | $ 813,974 | $ 784,807
Common Equity Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets | 0.0700 | 0.0700
Common Equity Tier One Risk Based Capital Required to be Well Capitalized To Risk Weighted Assets | $ 755,833 | $ 728,749
Common Equity Tier One Risk Based Capital Required to be Well Capitalized To Risk Weighted Assets | 6.50% | 6.50%
Banking Regulation, Tier One Risk-Based Capital [Abstract] |  |
Banking Regulation, Tier One Risk-Based Capital, Actual | $ 1,513,708 | $ 1,452,507
Banking Regulation, Tier One Risk-Based Capital Ratio, Actual | 0.1302 | 0.1296
Banking Regulation, Tier One Risk-Based Capital, Capital Adequacy, Minimum | $ 988,397 | $ 952,980
Banking Regulation, Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum | 0.0850 | 0.0850
Capital Required for Capital Adequacy to Risk Weighted Assets | $ 930,256 | $ 896,922
Banking Regulation, Tier One Risk-Based Capital Ratio, Well Capitalized, Minimum | 0.0800 | 0.0800
Banking Regulation, Total Capital [Abstract] |  |
Banking Regulation, Total Capital, Actual | $ 1,589,570 | $ 1,560,457
Banking Regulation, Total Risk-Based Capital Ratio, Actual | 0.1367 | 0.1392
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum | $ 1,220,960 | $ 1,177,211
Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum | 0.1050 | 0.1050
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | $ 1,162,820 | $ 1,121,153
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum | 0.1000 | 0.1000
Banking Regulation, Tier One Leverage Capital [Abstract] |  |
Banking Regulation, Tier One Leverage Capital, Actual | $ 1,513,708 | $ 1,452,507
Banking Regulation, Tier One Leverage Capital Ratio, Actual | 0.1010 | 0.1014
Banking Regulation, Tier One Leverage Capital, Capital Adequacy, Minimum | $ 599,578 | $ 573,094
Banking Regulation, Tier One Leverage Capital Ratio, Capital Adequacy, Minimum | 0.0400 | 0.0400
Tier One Leverage Capital Required to be Well Capitalized to Average Assets | $ 749,472 | $ 716,367
Banking Regulation, Tier One Leverage Capital Ratio, Well Capitalized, Minimum | 0.0500 | 0.0500

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