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CAPITAL - Risk-Based Capital (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital Conservation Buffer-Fully Phased-In 2.50%  
Capital Conservation Buffer-Phased-In Incremental Change 0.625%  
Excess Capital $ 318,300  
Risk Based Ratios [Abstract]    
Common Equity Tier One Capital $ 1,245,746 $ 1,215,613
Common Equity Tier One Capital Ratio 11.30% 11.87%
Common Equity Tier One Capital Required for Capital Adequacy $ 771,666 $ 652,874
Common Equity Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Fully Phased In Basel III 7.00% 7.00%
Common Equity Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets   6.38%
Common Equity Tier One Risk Based Capital Required for Capital Adequacy Fully Phased In Basel III   $ 716,881
Tier One Risk Based Capital [Abstract]    
Tier One Risk Based Capital $ 1,288,185 $ 1,257,366
Tier One Risk Based Capital to Risk Weighted Assets 11.69% 12.28%
Tier One Risk Based Capital Required for Capital Adequacy $ 937,023 $ 806,491
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 8.50% 7.88%
Tier One Risk Based Capital Required for Capital Adequacy Fully Phased In Basel III   $ 870,499
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Fully Phased In Basel III   8.50%
Capital [Abstract]    
Capital $ 1,475,813 $ 1,444,146
Capital to Risk Weighted Assets 13.39% 14.10%
Capital Required for Capital Adequacy $ 1,157,498 $ 1,011,314
Capital Required for Capital Adequacy to Risk Weighted Assets 10.50% 9.88%
Capital Required for Capital Adequacy Fully Phased In Basel III   $ 1,075,322
Capital Required for Capital Adequacy to Risk Weighted Assets Fully Phased In Basel III   10.50%
Tier One Leverage Capital [Abstract]    
Tier One Leverage Capital $ 1,288,185 $ 1,257,366
Tier One Leverage Capital to Average Assets 9.58% 9.71%
Tier One Leverage Capital Required for Capital Adequacy $ 537,606 $ 517,958
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Tier One Leverage Capital Required for Capital Adequacy Fully Phased In Basel III   $ 517,958
Tier One Leverage Capital Required for Capital Adequacy to Average Assets Fully Phased In Basel III   4.00%
Subsidiaries [Member]    
Risk Based Ratios [Abstract]    
Common Equity Tier One Capital $ 1,333,978 $ 1,279,492
Common Equity Tier One Capital Ratio 12.11% 12.50%
Common Equity Tier One Capital Required for Capital Adequacy $ 770,997 $ 652,590
Common Equity Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Fully Phased In Basel III 7.00% 7.00%
Common Equity Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets   6.38%
Common Equity Tier One Risk Based Capital Required to be Well Capitalized To Risk Weighted Assets $ 715,926 $ 665,386
Common Equity Tier One Risk Based Capital Required to be Well Capitalized To Risk Weighted Assets 6.50% 6.50%
Common Equity Tier One Risk Based Capital Required for Capital Adequacy Fully Phased In Basel III   $ 716,570
Tier One Risk Based Capital [Abstract]    
Tier One Risk Based Capital $ 1,334,082 $ 1,279,596
Tier One Risk Based Capital to Risk Weighted Assets 12.11% 12.50%
Tier One Risk Based Capital Required for Capital Adequacy $ 936,211 $ 806,141
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 8.50% 7.88%
Capital Required for Capital Adequacy to Risk Weighted Assets $ 881,140 $ 818,937
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 8.00% 8.00%
Tier One Risk Based Capital Required for Capital Adequacy Fully Phased In Basel III   $ 870,120
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Fully Phased In Basel III   8.50%
Capital [Abstract]    
Capital $ 1,399,817 $ 1,344,388
Capital to Risk Weighted Assets 12.71% 13.13%
Capital Required for Capital Adequacy $ 1,156,496 $ 1,010,875
Capital Required for Capital Adequacy to Risk Weighted Assets 10.50% 9.88%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets $ 1,101,425 $ 1,023,671
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00% 10.00%
Capital Required for Capital Adequacy Fully Phased In Basel III   $ 1,074,855
Capital Required for Capital Adequacy to Risk Weighted Assets Fully Phased In Basel III   10.50%
Tier One Leverage Capital [Abstract]    
Tier One Leverage Capital $ 1,334,082 $ 1,279,596
Tier One Leverage Capital to Average Assets 9.93% 9.89%
Tier One Leverage Capital Required for Capital Adequacy $ 537,299 $ 517,710
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets $ 671,623 $ 647,138
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00% 5.00%
Tier One Leverage Capital Required for Capital Adequacy Fully Phased In Basel III   $ 517,710
Tier One Leverage Capital Required for Capital Adequacy to Average Assets Fully Phased In Basel III   4.00%