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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2022
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:
March 31, 2022
(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$1,789,218 $578 $(99,052)$— $1,690,744 
Obligations of states and political subdivisions276,042 2,557 (11,404)— 267,195 
Corporate bonds7,652 29 (65)— 7,616 
Asset backed securities401,689 508 (4,845)— 397,352 
Total debt securities available for sale$2,474,601 $3,672 $(115,366)$— $2,362,907 
Debt Securities Held to Maturity
Obligations of U.S. government agencies$180,289 $222 $(3,070)$— $177,441 
Obligations of states and political subdivisions6,459 70 — — 6,529 
Total debt securities held to maturity$186,748 $292 $(3,070)$— $183,970 
December 31, 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$1,260,226 $8,193 $(11,030)$— $1,257,389 
Obligations of states and political subdivisions187,197 5,832 (785)— 192,244 
Corporate bonds6,722 34 — — 6,756 
Asset backed securities754,185 2,354 (4,990)— 751,549 
Total debt securities available for sale$2,208,330 $16,413 $(16,805)$— $2,207,938 
Debt Securities Held to Maturity
Obligations of U.S. government agencies192,068 8,131 — $— 200,199 
Obligations of states and political subdivisions7,691 250 — — 7,941 
Total debt securities held to maturity$199,759 $8,381 $— $— $208,140 
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity
As of March 31, 2022, 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$14,060 $13,955 $— $— 
Due after one year through five years124,473 120,609 1,693 1,717 
Due after five years through ten years376,294 370,606 14,559 14,431 
Due after ten years1,959,774 1,857,737 170,496 167,822 
Totals$2,474,601 $2,362,907 $186,748 $183,970 
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:
March 31, 2022: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$1,385,647 $(79,940)$220,899 $(19,112)$1,606,546 $(99,052)
Obligations of states and political subdivisions106,944 (10,040)9,045 (1,364)115,989 (11,404)
Corporate bonds4,112 (65)— — 4,112 (65)
Asset backed securities212,168 (2,544)107,603 (2,301)319,771 (4,845)
Total debt securities available for sale$1,708,871 $(92,589)$337,547 $(22,777)$2,046,418 $(115,366)
Debt Securities Held to Maturity
Obligations of U.S. government agencies$147,078 $(3,070)$— $— $147,078 $(3,070)
December 31, 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$947,108 $(9,737)$44,086 $(1,293)$991,194 $(11,030)
Obligations of states and political subdivisions56,153 (785)— — 56,153 (785)
Asset backed securities389,837 (4,118)109,748 (872)499,585 (4,990)
Total debt securities available for sale$1,393,098 $(14,640)$153,834 $(2,165)$1,546,932 $(16,805)
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:
March 31, 2022December 31, 2021
AAA/AA/ABBB/BB/BAAA/AA/ABBB/BB/B
(In thousands)(In thousands)
Debt Securities Held to Maturity
Obligations of U.S. government agencies$180,290 $— $192,068 $— 
Obligations of states and political subdivisions6,458 — 7,691 — 
Total debt securities held to maturity$186,748 $— $199,759 $—