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Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	$ 165,949
Available-for-sale investments, After 1 through 5 years	409,080
Available-for-sale investments, After 5 through 10 years	300,482
Available-for-sale investments, After ten years	3,729
Available-for-sale investments, Fair Value	$ 879,240	$ 685,636
Available-for-sale, Weighted average yield, One year or less (in hundredths)	1.94%
Available-for-sale , Weighted average yield,After 1 through 5 years (in hundredths)	2.30%
Available-for-sale, Weighted average yield,After 5 through 10 years (in hundredths)	1.85%
Available-for-sale , Weighted average yield,After ten years (in hundredths)	2.96%
Available-for-sale , Weighted average yield,Total (in hundredths)	2.08%
Available-for-sale, Full Tax-equivalent yield, One year or less (in hundredths)	2.14%
Available-for-sale, Full Tax-equivalent yield,After 1 through 5 years (in hundredths)	2.49%
Available-for-sale, Full Tax-equivalent yield, After 5 through 10 years (in hundredths)	2.25%
Available-for-sale, Full Tax-equivalent yield,After ten years (in hundredths)	3.95%
Available-for-sale, Full Tax-equivalent yield,Total (in hundredths)	2.35%
Held-to-maturity, Maturity [Abstract]
Held-to-maturity, One Year or less	$ 0
Held-to-maturity, After1 through 5 years	5,016
Held-to-maturity	$ 5,016	69,542
Held To Maturity Weighted average yield, One year or less	0.00%
Held To Maturity Weighted average yield, After 1 through 5 years	2.06%
Held To Maturity Weighted average yield After 5 through 10 years	0.00%
Held To Maturity Weighted average yield After ten years	0.00%
Held To Maturity Weighted average yield ,Total	2.06%
Held To Maturity, Full tax-equivalent yield , One year or less	0.00%
Held To Maturity, Full tax-equivalent yield , After 1 through 5 years	2.06%
Held To Maturity, Full tax-equivalent yield , After 5 through 10 years	0.00%
Held To Maturity, Full tax-equivalent yield , After ten years	0.00%
Held To Maturity, Full tax-equivalent yield , Total	2.06%
U.S. Treasury Securities and Obligations of U.S. Government Corporations & Agencies
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	$ 85,047
Available-for-sale investments, After 1 through 5 years	30,206
Available-for-sale investments, After 5 through 10 years	11,816
Available-for-sale investments, After ten years	0
Available-for-sale investments, Fair Value	127,069	107,320
Held-to-maturity, Maturity [Abstract]
Held-to-maturity, One Year or less	0
Held-to-maturity, After1 through 5 years	5,016
Held-to-maturity, After 5 through 10 years	0
Held-to-maturity, After ten years	0
Held-to-maturity	5,016	69,542
Obligations of States and Political Subdivisions
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	29,972
Available-for-sale investments, After 1 through 5 years	71,906
Available-for-sale investments, After 5 through 10 years	144,237
Available-for-sale investments, After ten years	3,729
Available-for-sale investments, Fair Value	249,844	178,433
Mortgage-backed Securities: GSE Residential
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	50,930
Available-for-sale investments, After 1 through 5 years	295,989
Available-for-sale investments, After 5 through 10 years	144,429
Available-for-sale investments, After ten years	0
Available-for-sale investments, Fair Value	491,348	396,126
Other Securities
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	0
Available-for-sale investments, After 1 through 5 years	10,979
Available-for-sale investments, After 5 through 10 years	0
Available-for-sale investments, After ten years	0
Available-for-sale investments, Fair Value	$ 10,979	$ 3,757

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The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security.

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The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature after one through five years. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security.

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The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature in less than twelve months. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security.

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Weighted average yield for available-for-sale investment securities held by the entity with maturities of one year or less.

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