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Commitments and Contingencies (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]    
Loan commitments to extend credit $ 8,183,158,000 $ 7,528,248,000
Standby letters of credit 355,503,000 364,210,000
Commitment To Contribute Capital 129,213,000 101,991,000
Purchase Commitment, Remaining Minimum Amount Committed 50,000 50,000
Unused Commitments to Extend Credit $ 8,667,924,000 $ 7,994,499,000