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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2023
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, 2023
(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$1,531,759 $5 $(174,329)$— $1,357,435 
Obligations of states and political subdivisions308,129 698 (28,927)— 279,900 
Corporate bonds6,165 — (427)— 5,738 
Asset backed securities440,259 18 (12,913)— 427,364 
Non-agency collateralized mortgage obligations375,345 — (39,970)— 335,375 
Total debt securities available for sale$2,661,657 $721 $(256,566)$— $2,405,812 
Debt Securities Held to Maturity
Obligations of U.S. government agencies$148,700 $1 $(9,942)— 138,759 
Obligations of states and political subdivisions3,367 14 (5)— 3,376 
Total debt securities held to maturity$152,067 $15 $(9,947)$— $142,135 
December 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$1,568,408 $3 $(195,642)$— $1,372,769 
Obligations of states and political subdivisions332,625 401 (39,821)— 293,205 
Corporate bonds6,164 — (413)— 5,751 
Asset backed securities454,943 17 (15,193)— 439,767 
Non-agency collateralized mortgage obligations380,847 — (39,901)— 340,946 
Total debt securities available for sale$2,742,987 $421 $(290,970)$— $2,452,438 
Debt Securities Held to Maturity
Obligations of U.S. government agencies$154,830 $2 $(11,013)$— $143,819 
Obligations of states and political subdivisions6,153 13 (47)— 6,119 
Total debt securities held to maturity$160,983 $15 $(11,060)$— $149,938 
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity
As of March 31, 2023, 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$57,662 $56,205 $— $— 
Due after one year through five years114,294 109,745 5,316 5,157 
Due after five years through ten years407,960 389,802 9,592 9,081 
Due after ten years2,081,741 1,850,060 137,159 127,897 
Totals$2,661,657 $2,405,812 $152,067 $142,135 
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, 2023: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$298,264 $(18,024)$1,058,654 $(156,305)$1,356,918 $(174,329)
Obligations of states and political subdivisions126,230 (7,797)105,039 (21,130)231,269 (28,927)
Corporate bonds1,846 (135)3,892 (292)5,738 (427)
Asset backed securities112,239 (1,994)309,739 (10,919)421,978 (12,913)
Non-agency collateralized mortgage obligations73,343 (2,639)248,617 (37,331)321,960 (39,970)
Total debt securities available for sale$611,922 $(30,589)$1,725,941 $(225,977)$2,337,863 $(256,566)
Debt Securities Held to Maturity
Obligations of U.S. government agencies$41,389 $(2,252)$97,370 $(7,690)$138,759 $(9,942)
Obligations of states and political subdivisions1,050 (5)— — 1,050 (5)
Total debt securities held to maturity$42,439 $(2,257)$97,370 $(7,690)$139,809 $(9,947)
December 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$605,615 $(61,408)$766,612 $(134,234)$1,372,227 $(195,642)
Obligations of states and political subdivisions219,532 (26,904)43,282 (12,917)262,814 (39,821)
Corporate bonds5,751 (413)— — 5,751 (413)
Asset backed securities231,703 (4,955)205,329 (10,238)437,032 (15,193)
Non-agency collateralized mortgage obligations123,075 (3,421)203,620 (36,480)326,695 (39,901)
Total debt securities available for sale$1,185,676 (97,101)$1,218,843 $(193,869)$2,404,519 $(290,970)
Debt Securities Held to Maturity
Obligations of U.S. government agencies$143,577 $(11,013)$— $— $143,577 $(11,013)
Obligations of states and political subdivisions4,530 (47)— — 4,530 (47)
Total debt securities held to maturity$148,107 $(11,060)$— $— $148,107 $(11,060)
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, 2023December 31, 2022
(in thousands)
AAA/AA/ABBB/BB/BAAA/AA/ABBB/BB/B
Obligations of U.S. government agencies$148,700 $— $154,830 $— 
Obligations of states and political subdivisions3,367 — 6,153 — 
Total debt securities held to maturity$152,067 $— $160,983 $—