Investment Securities Investment Securities, Part III (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	$ 174,049
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	142,357
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	79,095
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	1,352
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	396,853
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	701,225
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	304,372
Available-For-Sale Securities, Debt Maturities, SIngle Maturity Date, Fair Value single maturity [Abstract]
AFS Securities, Debt Maturities, Single Maturity Date, Next Twelve Months, Fair Value	171,938
AFS Securities, Debt Maturities, Single Maturity Date, Year Two Through Five, Fair Value	141,933
AFS Securities, Debt Maturities, Single Maturity Date, Year Six Through Ten, Fair Value	78,294
AFS Securities, Debt Maturities, Single Maturity Date, After Ten Years, Fair Value	1,437
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	393,602
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	298,672
Fair Value	692,274	$ 578,579
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	39,995
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	29,441
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost	0
Held-to-maturity, at amortized cost (estimated fair value of $67,909 and $68,457 at December 31, 2018 and 2017, respectively)	69,436	69,332
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	38,790
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	29,119
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	0
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	0
Debt Securities, Held-to-maturity, Fair Value	$ 67,909	$ 68,457

AFS Securities, Debt Maturities, Single Maturity Date, After Ten Years, Fair Value

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AFS Securities, Debt Maturities, Single Maturity Date, Next Twelve Months, Fair Value

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AFS Securities, Debt Maturities, Single Maturity Date, Year Six Through Ten, Fair Value

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Available-For-Sale Securities, Debt Maturities, SIngle Maturity Date, Fair Value single maturity [Abstract]

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