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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost and Estimated Fair Values of Investments Securities
The amortized cost, estimated fair values and allowance for credit losses of investments in debt securities are summarized in the following tables:
June 30, 2021
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossesEstimated
Fair
Value
Debt Securities Available for Sale
Obligations of U.S. government agencies$1,126,342 $11,628 $(4,554)$— $1,133,416 
Obligations of states and political subdivisions141,168 6,208 (452)— 146,924 
Corporate bonds2,473 83 — — 2,556 
Asset backed securities563,347 2,941 (1,616)— 564,672 
Total debt securities available for sale$1,833,330 $20,860 $(6,622)$— $1,847,568 
Debt Securities Held to Maturity
Obligations of U.S. government agencies$226,925 $10,926 $— $— $237,851 
Obligations of states and political subdivisions8,853 315 — — 9,168 
Total debt securities held to maturity$235,778 $11,241 $— $— $247,019 
December 31, 2020
(in thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Allowance for Credit LossesEstimated
Fair
Value
Debt Securities Available for Sale
Obligations of U.S. government agencies$795,555 $17,710 $(891)$— $812,374 
Obligations of states and political subdivisions123,347 5,748 — — 129,095 
Corporate bonds2,459 85 — — 2,544 
Asset backed securities473,720 1,682 (5,151)— 470,251 
Total debt securities available for sale$1,395,081 $25,225 $(6,042)$— $1,414,264 
Debt Securities Held to Maturity
Obligations of U.S. government agencies273,667 13,774 — $— 287,441 
Obligations of states and political subdivisions10,896 389 — — 11,285 
Total debt securities held to maturity$284,563 $14,163 $— $— $298,726 
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity
As of June 30, 2021, the contractual final maturity for available for sale and held to maturity investment securities is as follows:
Debt SecuritiesAvailable for SaleHeld to Maturity
(in thousands)Amortized
Cost		Estimated
Fair Value		Amortized
Cost		Estimated
Fair Value
Due in one year$1,093 $1,117 $— $— 
Due after one year through five years181,624 181,791 1,011 1,125 
Due after five years through ten years337,145 338,985 20,641 21,363 
Due after ten years1,313,468 1,325,675 214,126 224,531 
Totals$1,833,330 $1,847,568 $235,778 $247,019 
Gross Unrealized Losses on Investment Securities
Gross unrealized losses on debt securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows:
June 30, 2021:Less than 12 months12 months or moreTotal
(in thousands)Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Debt Securities Available for Sale
Obligations of U.S. government agencies$566,137 $(4,554)$— $— $566,137 $(4,554)
Obligations of states and political subdivisions24,207 (452)— — 24,207 (452)
Asset backed securities103,518 (394)152,895 (1,222)256,413 (1,616)
Total debt securities available for sale$693,862 $(5,400)$152,895 $(1,222)$846,757 $(6,622)
December 31, 2020:Less than 12 months12 months or moreTotal
(in thousands)Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss
Debt Securities Available for Sale
Obligations of U.S. government agencies$160,543 $(891)$— $— $160,543 $(891)
Asset backed securities51,544 (441)297,020 (4,710)348,564 (5,151)
Total debt securities available for sale$212,087 $(1,332)$297,020 $(4,710)$509,107 $(6,042)
Amortized Cost of Debt Securities Held-to-Maturity The following table summarizes the amortized cost of debt securities held-to-maturity at the dates indicated, aggregated by credit quality indicator:
June 30, 2021December 31, 2020
AAA/AA/ABBB/BB/BAAA/AA/ABBB/BB/B
(In thousands)(In thousands)
Debt Securities Held to Maturity
Obligations of U.S. government agencies$226,925 $— $273,667 $— 
Obligations of states and political subdivisions8,853 — 10,896 — 
Total debt securities held to maturity$235,778 $— $284,563 $—