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Fair Value - Estimated fair value and related carrying amount, of the Company's financial instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financial liabilities:
Other borrowings	$ 25,000
Carrying Amount
Financial assets:
Cash and cash equivalents	6,404,512	$ 4,609,255
Trading securities	89,925	10,674
Investment securities	5,719,031	4,446,657
Loans held for sale	171,447	290,467
Loans, net of allowance for loan losses	23,682,677	24,206,825
Accrued interest receivable	99,138	107,601
Mortgage servicing rights	57,351	43,820
Interest rate swap - non-designated hedge	516,632	802,763
Other derivative financial instruments (mortgage banking related)	9,513	11,136
Financial liabilities:
Deposits	33,242,369	30,693,882
Federal funds purchased and securities sold under agreements to repurchase	862,429	779,666
Other borrowings	351,548	390,179
Accrued interest payable	4,774	7,103
Interest rate swap - non-designated hedge	518,221	804,832
Fair Value
Financial assets:
Cash and cash equivalents	6,404,512	4,609,255
Trading securities	89,925	10,674
Investment securities	5,698,158	4,448,300
Loans held for sale	171,447	290,467
Loans, net of allowance for loan losses	23,845,019	24,757,859
Accrued interest receivable	99,138	107,601
Mortgage servicing rights	57,351	43,820
Interest rate swap - non-designated hedge	516,632	802,763
Other derivative financial instruments (mortgage banking related)	9,513	11,136
Financial liabilities:
Deposits	33,254,282	30,719,416
Federal funds purchased and securities sold under agreements to repurchase	862,429	779,666
Other borrowings	350,466	386,126
Accrued interest payable	4,774	7,103
Interest rate swap - non-designated hedge	518,221	804,832
Commitments to extend credit | Fair Value
Financial liabilities:
Commitments to extend credit	45,968	136,726
Quoted Prices In Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	6,404,512	4,609,255
Investment securities	160,607	160,443
Significant Other Observable Inputs (Level 2)
Financial assets:
Trading securities	89,925	10,674
Investment securities	5,537,551	4,287,857
Loans held for sale	171,447	290,467
Accrued interest receivable	16,015	12,952
Interest rate swap - non-designated hedge	516,632	802,763
Other derivative financial instruments (mortgage banking related)	9,513	11,136
Financial liabilities:
Deposits	33,254,282	30,719,416
Federal funds purchased and securities sold under agreements to repurchase	862,429	779,666
Other borrowings	350,466	386,126
Accrued interest payable	4,774	7,103
Interest rate swap - non-designated hedge	518,221	804,832
Significant Other Observable Inputs (Level 2) | Commitments to extend credit
Financial liabilities:
Commitments to extend credit	45,968	136,726
Significant Unobservable Inputs (Level 3)
Financial assets:
Loans, net of allowance for loan losses	23,845,019	24,757,859
Accrued interest receivable	83,123	94,649
Mortgage servicing rights	$ 57,351	$ 43,820

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