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Investment Securities (Tables)
 9 Months Ended
Sep. 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:
September 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$1,241,676 $11,001 $(8,061)$— $1,244,616 
Obligations of states and political subdivisions164,043 5,360 (1,296)— 168,107 
Corporate bonds6,738 58 — — 6,796 
Asset backed securities675,430 3,119 (2,247)— 676,302 
Total debt securities available for sale$2,087,887 $19,538 $(11,604)$— $2,095,821 
Debt Securities Held to Maturity
Obligations of U.S. government agencies$208,127 $10,910 $— $— $219,037 
Obligations of states and political subdivisions8,852 285 — — 9,137 
Total debt securities held to maturity$216,979 $11,195 $— $— $228,174 
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 September 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$8,771 $8,872 $— $— 
Due after one year through five years154,411 154,531 1,020 1,129 
Due after five years through ten years337,783 339,617 22,548 23,346 
Due after ten years1,586,922 1,592,801 193,411 203,699 
Totals$2,087,887 $2,095,821 $216,979 $228,174 
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:
September 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$778,650 $(7,907)$11,463 $(154)$790,113 $(8,061)
Obligations of states and political subdivisions62,820 (1,296)— — 62,820 (1,296)
Asset backed securities232,417 (1,325)129,656 (922)362,073 (2,247)
Total debt securities available for sale$1,073,887 $(10,528)$141,119 $(1,076)$1,215,006 $(11,604)
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:
September 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$208,127 $— $273,667 $— 
Obligations of states and political subdivisions8,852 — 10,896 — 
Total debt securities held to maturity$216,979 $— $284,563 $—