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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 163,165
Due from one year to five years	262,405
Due from five years to ten years	430,737
Due after ten years	1,113,977
Amortized cost, before securities without debt maturities	1,970,284
Amortized Cost	3,465,368
Estimated Fair Value
Due in one year or less	163,187
Due from one year to five years	259,212
Due from five years to ten years	426,189
Due after ten years	1,065,372
Available for sale securities, debt maturities, before securities without single maturities	1,913,960
Estimated Fair Value	3,324,333	$ 3,187,390
Amortized Cost
Due in one year or less	0
Due from one year to five years	0
Due from five years to ten years	0
Due after ten years	0
Debt securities, held-to-maturity, maturity, allocated and single maturity date, amortized cost, total	0
Amortized Cost, Held to Maturity	964,341	980,384
Estimated Fair Value
Due in one year or less	0
Due from one year to five years	0
Due from five years to ten years	0
Due after ten years	0
Debt securities, held-to-maturity, maturity, Allocated and single maturity date, fair value	0
Estimated Fair Value, Held to Maturity	888,989	965,867
Mortgage-Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	295,590
Amortized Cost	295,590	231,607
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	275,602
Estimated Fair Value	275,602	229,795
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	384,675
Amortized Cost, Held to Maturity	384,675	404,958
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	365,264
Estimated Fair Value, Held to Maturity	365,264	408,913
Commercial Mortgage Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	1,024,224
Amortized Cost	1,024,224	974,541
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	963,507
Estimated Fair Value	963,507	971,148
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	579,666
Amortized Cost, Held to Maturity	579,666	575,426
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	523,725
Estimated Fair Value, Held to Maturity	523,725	556,954
Collateralized Mortgage Obligations [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	175,270
Amortized Cost	175,270	206,532
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	171,264
Estimated Fair Value	171,264	$ 209,359
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	0
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	$ 0

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