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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, 2019	Dec. 31, 2018
Amortized Cost
Due in one year or less	$ 9,252
Due from one year to five years	55,635
Due from five years to ten years	120,920
Due after ten years	363,625
Amortized cost, before securities without debt maturities	549,432
Amortized Cost	2,168,885
Estimated Fair Value
Due in one year or less	9,256
Due from one year to five years	57,030
Due from five years to ten years	120,605
Due after ten years	362,415
Available for sale securities, debt maturities, before securities without single maturities	549,306
Estimated Fair Value	2,159,806	$ 2,080,294
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	155,998
Debt securities, held-to-maturity, maturity, allocated and single maturity date, amortized cost, total	155,998
Amortized Cost, Held to Maturity	588,443	606,679
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	161,708
Debt securities, held-to-maturity, maturity, Allocated and single maturity date, fair value	161,708
Estimated Fair Value, Held to Maturity	603,607	611,419
Collateralized Mortgage Obligations [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	889,046
Amortized Cost	889,046
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	887,405
Estimated Fair Value	887,405
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
Commercial Mortgage Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	282,483
Amortized Cost	282,483
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	282,237
Estimated Fair Value	282,237
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
Mortgage-Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	447,924
Amortized Cost	447,924
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	440,858
Estimated Fair Value	440,858
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	432,445
Amortized Cost, Held to Maturity	432,445	450,545
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	441,899
Estimated Fair Value, Held to Maturity	$ 441,899	$ 454,212

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