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Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) $ in Thousands	Jun. 30, 2021 USD ($) security	Dec. 31, 2020 USD ($) security
Amortized Cost
Due within one year	$ 350
Due after one year through five years	0
Due after five years through ten years	37,825
Due after ten years	91,372
Amortized Cost	2,254,609	$ 2,239,433
Estimated Fair Value
Due within one year	351
Due after one year through five years	0
Due after five years through ten years	38,270
Due after ten years	92,789
Estimated Fair Value	2,274,170	2,285,611
Carrying value of securities pledged to secure public deposits, pledged for various borrowings and for other purposes required or permitted by law	$ 354,800	$ 376,100
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	91	33
Collateralized mortgage obligations
Amortized Cost
Amortized Cost	$ 858,603	$ 990,679
Estimated Fair Value
No single maturity date, fair value	864,576
Estimated Fair Value	864,576	1,001,317
Mortgage-backed securities: Residential
Amortized Cost
Amortized Cost	663,223	672,667
Estimated Fair Value
No single maturity date, fair value	660,202
Estimated Fair Value	$ 660,202	$ 681,013
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	47	8
Mortgage-backed securities: Commercial
Amortized Cost
Amortized Cost	$ 540,908	$ 482,874
Estimated Fair Value
No single maturity date, fair value	555,613
Estimated Fair Value	$ 555,613	$ 507,879
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	11	1
Asset-backed Securities
Amortized Cost
Amortized Cost	$ 62,328
Estimated Fair Value
No single maturity date, fair value	62,369
Estimated Fair Value	$ 62,369
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	4
Municipal Bonds [Member]
Amortized Cost
Amortized Cost	$ 106,125	$ 86,213
Estimated Fair Value
Estimated Fair Value	$ 108,796	$ 89,268
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	5	1

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