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Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | 6 Months Ended |
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Jun. 30, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Available-for-sale investments, One year or less | $ 218,379 |
Available-for-sale investments, After 1 through 5 years | 331,447 |
Available-for-sale investments, After 5 through 10 years | 789,972 |
Available-for-sale investments, After ten years | 10,150 |
Available-for-sale investments, Fair Value | $ 1,349,948 | $ 1,421,422
Available-for-sale, Weighted average yield, One year or less (in hundredths) | 1.54% |
Available-for-sale , Weighted average yield,After 1 through 5 years (in hundredths) | 2.46% |
Available-for-sale, Weighted average yield,After 5 through 10 years (in hundredths) | 1.77% |
Available-for-sale , Weighted average yield,After ten years (in hundredths) | 1.69% |
Available-for-sale , Weighted average yield,Total (in hundredths) | 1.89% |
Available-for-sale, Full Tax-equivalent yield, One year or less (in hundredths) | 1.65% |
Available-for-sale, Full Tax-equivalent yield,After 1 through 5 years (in hundredths) | 2.75% |
Available-for-sale, Full Tax-equivalent yield, After 5 through 10 years (in hundredths) | 1.95% |
Available-for-sale, Full Tax-equivalent yield,After ten years (in hundredths) | 1.82% |
Available-for-sale, Full Tax-equivalent yield,Total (in hundredths) | 2.09% |
Held-to-maturity, Maturity [Abstract] |  |
Held-to-maturity, One Year or less | $ 0 |
Held-to-maturity, After1 through 5 years | 0 |
Held-to-maturity, After 5 through 10 years | 0 |
Held-to-maturity, After ten years | 2,972 |
Held-to-maturity | $ 2,972 | 7,030
Held To Maturity Weighted average yield, One year or less | 0.00% |
Held To Maturity Weighted average yield, After 1 through 5 years | 0.00% |
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 | 0.00% |
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 | 0.00% |
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 | 0.00% |
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Available-for-sale investments, One year or less | $ 170,756 |
Available-for-sale investments, After 1 through 5 years | 56,145 |
Available-for-sale investments, After 5 through 10 years | 9,946 |
Available-for-sale investments, After ten years | 0 |
Available-for-sale investments, Fair Value | 236,847 | 203,815
Held-to-maturity, Maturity [Abstract] |  |
Held-to-maturity |  | 5,001
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 | 22,218 |
Available-for-sale investments, After 1 through 5 years | 95,449 |
Available-for-sale investments, After 5 through 10 years | 209,021 |
Available-for-sale investments, After ten years | 1,134 |
Available-for-sale investments, Fair Value | 327,822 | 395,457
Mortgage-backed Securities: GSE Residential |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Available-for-sale investments, One year or less | 6,114 |
Available-for-sale investments, After 1 through 5 years | 113,107 |
Available-for-sale investments, After 5 through 10 years | 570,106 |
Available-for-sale investments, After ten years | 9,016 |
Available-for-sale investments, Fair Value | 698,343 | 791,038
Other Securities |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Available-for-sale investments, One year or less | 19,291 |
Available-for-sale investments, After 1 through 5 years | 66,746 |
Available-for-sale investments, After 5 through 10 years | 899 |
Available-for-sale investments, After ten years | 0 |
Available-for-sale investments, Fair Value | 86,936 | 31,112
Other Investments |  |
Held-to-maturity, Maturity [Abstract] |  |
Held-to-maturity, One Year or less | 0 |
Held-to-maturity, After1 through 5 years | 0 |
Held-to-maturity, After 5 through 10 years | 0 |
Held-to-maturity, After ten years | 2,972 |
Held-to-maturity | $ 2,972 | $ 2,029

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