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Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Amortized Cost
Due within one year	$ 750
Due after one year through five years	3,560
Due after five years through ten years	2,648
Due after ten years	68,049
Amortized Cost	1,817,265	$ 1,893,618
Estimated Fair Value
Due within one year	752
Due after one year through five years	3,569
Due after five years through ten years	2,720
Due after ten years	66,856
Estimated Fair Value	1,826,903	1,846,265
Carrying value of securities pledged to secure public deposits, pledged for various borrowings and for other purposes required or permitted by law	350,400	354,600
Collateralized mortgage obligations
Amortized Cost
Amortized Cost	842,576	914,710
Estimated Fair Value
No single maturity date	844,899
Estimated Fair Value	844,899	895,122
Residential
Amortized Cost
Amortized Cost	369,476	415,659
Estimated Fair Value
No single maturity date	367,176
Estimated Fair Value	367,176	402,605
Commercial
Amortized Cost
Amortized Cost	530,206	481,081
Estimated Fair Value
No single maturity date	540,931
Estimated Fair Value	540,931	469,126
Corporate securities
Amortized Cost
Amortized Cost	5,000	5,000
Estimated Fair Value
Estimated Fair Value	3,880	3,826
Municipal securities
Amortized Cost
Amortized Cost	70,007	77,168
Estimated Fair Value
Estimated Fair Value	$ 70,017	$ 75,586

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