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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 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:
June 30, 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$1,497,396 $— $(187,972)$— $1,309,424 
Obligations of states and political subdivisions307,961 377 (32,687)— 275,651 
Corporate bonds6,168 — (667)— 5,501 
Asset backed securities464,331 46 (10,910)— 453,467 
Non-agency collateralized mortgage obligations317,319 — (40,949)— 276,370 
Total debt securities available for sale$2,593,175 $423 $(273,185)$— $2,320,413 
Debt Securities Held to Maturity
Obligations of U.S. government agencies$142,466 $1 $(10,664)— 131,803 
Obligations of states and political subdivisions2,651 1 (46)— 2,606 
Total debt securities held to maturity$145,117 $2 $(10,710)$— $134,409 
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 June 30, 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$91,262 $88,777 $— $— 
Due after one year through five years75,911 72,601 6,790 6,485 
Due after five years through ten years406,088 385,442 30,471 27,882 
Due after ten years2,019,914 1,773,593 107,856 100,042 
Totals$2,593,175 $2,320,413 $145,117 $134,409 
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, 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$148,377 $(9,454)$1,160,872 $(178,518)$1,309,249 $(187,972)
Obligations of states and political subdivisions42,997 (958)204,574 (31,729)247,571 (32,687)
Corporate bonds— — 5,501 (667)5,501 (667)
Asset backed securities88,449 (1,240)359,902 (9,670)448,351 (10,910)
Non-agency collateralized mortgage obligations61,766 (2,173)214,604 (38,776)276,370 (40,949)
Total debt securities available for sale$341,589 $(13,825)$1,945,453 $(259,360)$2,287,042 $(273,185)
Debt Securities Held to Maturity
Obligations of U.S. government agencies$39,059 $(2,530)$92,743 $(8,134)$131,802 $(10,664)
Obligations of states and political subdivisions973 (22)546 (24)1,519 (46)
Total debt securities held to maturity$40,032 $(2,552)$93,289 $(8,158)$133,321 $(10,710)
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:
June 30, 2023December 31, 2022
(in thousands)
AAA/AA/ABBB/BB/BAAA/AA/ABBB/BB/B
Obligations of U.S. government agencies$142,466 $— $154,830 $— 
Obligations of states and political subdivisions2,651 — 6,153 — 
Total debt securities held to maturity$145,117 $— $160,983 $—