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Securities - Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Available-for-sale securities
Fair value, less than 12 months	$ 1,106,747	$ 417,782
Unrealized losses, less than 12 months	28,355	3,014
Fair value, 12 months or longer	12,530	9,266
Unrealized losses, 12 months or longer	625	460
Fair Value	1,119,277	427,048
Unrealized Losses	28,980	3,474
U.S. Treasuries
Available-for-sale securities
Fair value, less than 12 months	29,111
Unrealized losses, less than 12 months	523
Fair value, 12 months or longer	0
Unrealized losses, 12 months or longer	0
Fair Value	29,111
Unrealized Losses	523
Obligations of U.S. Government sponsored entities
Available-for-sale securities
Fair value, less than 12 months	531,501	310,711
Unrealized losses, less than 12 months	13,636	1,992
Fair value, 12 months or longer	0	0
Unrealized losses, 12 months or longer	0	0
Fair Value	531,501	310,711
Unrealized Losses	13,636	1,992
Obligations of U.S. states and political subdivisions
Available-for-sale securities
Fair value, less than 12 months	19,227	8,868
Unrealized losses, less than 12 months	207	40
Fair value, 12 months or longer	0	0
Unrealized losses, 12 months or longer	0	0
Fair Value	19,227	8,868
Unrealized Losses	207	40
U.S. Government agencies
Available-for-sale securities
Fair value, less than 12 months	55,053	10,560
Unrealized losses, less than 12 months	642	396
Fair value, 12 months or longer	4,736	1,819
Unrealized losses, 12 months or longer	427	250
Fair Value	59,789	12,379
Unrealized Losses	1,069	646
U.S. Government sponsored entities
Available-for-sale securities
Fair value, less than 12 months	471,855	87,643
Unrealized losses, less than 12 months	13,347	586
Fair value, 12 months or longer	5,378	5,068
Unrealized losses, 12 months or longer	114	89
Fair Value	477,233	92,711
Unrealized Losses	13,461	675
U.S. corporate debt securities
Available-for-sale securities
Fair value, less than 12 months	0	0
Unrealized losses, less than 12 months	0	0
Fair value, 12 months or longer	2,416	2,379
Unrealized losses, 12 months or longer	84	121
Fair Value	2,416	2,379
Unrealized Losses	$ 84	$ 121

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