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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, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Available-for-sale investments, One year or less | $ 170,732 |
Available-for-sale investments, After 1 through 5 years | 496,707 |
Available-for-sale investments, After 5 through 10 years | 546,300 |
Available-for-sale investments, After ten years | 8,459 |
Available-for-sale investments, Fair Value | $ 1,222,198 | $ 879,240
Available-for-sale, Weighted average yield, One year or less (in hundredths) | 1.64% |
Available-for-sale , Weighted average yield,After 1 through 5 years (in hundredths) | 2.14% |
Available-for-sale, Weighted average yield,After 5 through 10 years (in hundredths) | 1.65% |
Available-for-sale , Weighted average yield,After ten years (in hundredths) | 2.12% |
Available-for-sale , Weighted average yield,Total (in hundredths) | 1.85% |
Available-for-sale, Full Tax-equivalent yield, One year or less (in hundredths) | 1.80% |
Available-for-sale, Full Tax-equivalent yield,After 1 through 5 years (in hundredths) | 2.31% |
Available-for-sale, Full Tax-equivalent yield, After 5 through 10 years (in hundredths) | 1.90% |
Available-for-sale, Full Tax-equivalent yield,After ten years (in hundredths) | 2.72% |
Available-for-sale, Full Tax-equivalent yield,Total (in hundredths) | 2.06% |
Held-to-maturity, Maturity [Abstract] |  |
Held-to-maturity, One Year or less | $ 5,008 |
Held-to-maturity, After1 through 5 years | 0 |
Held-to-maturity, After 5 through 10 years | 0 |
Held-to-maturity, After ten years | 2,041 |
Held-to-maturity | $ 7,049 | 5,016
Held To Maturity Weighted average yield, One year or less | 2.06% |
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 | 2.06% |
Held To Maturity, Full tax-equivalent yield , One year or less | 2.06% |
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 | 2.06% |
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 | $ 116,012 |
Available-for-sale investments, After 1 through 5 years | 64,894 |
Available-for-sale investments, After 5 through 10 years | 11,273 |
Available-for-sale investments, After ten years | 0 |
Available-for-sale investments, Fair Value | 192,179 | 127,069
Held-to-maturity, Maturity [Abstract] |  |
Held-to-maturity, One Year or less | 5,008 |
Held-to-maturity, After1 through 5 years | 0 |
Held-to-maturity, After 5 through 10 years | 0 |
Held-to-maturity, After ten years | 0 |
Held-to-maturity | 5,008 | 5,016
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 | 25,869 |
Available-for-sale investments, After 1 through 5 years | 81,102 |
Available-for-sale investments, After 5 through 10 years | 190,196 |
Available-for-sale investments, After ten years | 8,459 |
Available-for-sale investments, Fair Value | 305,626 | 249,844
Mortgage-backed Securities: GSE Residential |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Available-for-sale investments, One year or less | 18,751 |
Available-for-sale investments, After 1 through 5 years | 326,494 |
Available-for-sale investments, After 5 through 10 years | 343,325 |
Available-for-sale investments, After ten years | 0 |
Available-for-sale investments, Fair Value | 688,570 | 491,348
Other Securities |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Available-for-sale investments, One year or less | 10,100 |
Available-for-sale investments, After 1 through 5 years | 24,217 |
Available-for-sale investments, After 5 through 10 years | 1,506 |
Available-for-sale investments, After ten years | 0 |
Available-for-sale investments, Fair Value | 35,823 | $ 10,979
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 | 2,041 |
Held-to-maturity | $ 2,041 |

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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