XML 63 R51.htm IDEA: XBRL DOCUMENT
v3.24.3

Investment Securities - Unrealized Losses and Estimated Fair Value of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | $ 51,060 | $ 143,467
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (1,738) | (2,794)
Fair Value of Available-for-Sale Securities, 12 Months or More | 2,712,008 | 2,887,122
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (260,071) | (333,485)
Fair Value of Available-for-Sale Securities, Total | 2,763,068 | 3,030,589
Unrealized Losses of Available-for-Sale Securities, Total | (261,809) | (336,279)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 22,950 | 69,991
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (483) | (1,158)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 1,108,380 | 1,062,828
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (83,103) | (110,905)
Fair Value of Held-to-Maturity Securities, Total | 1,131,330 | 1,132,819
Unrealized Losses of Held-to-Maturity Securities | (83,586) | (112,063)
U.S. government-sponsored enterprises |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 18,911 | 2,742
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (132) | (2)
Fair Value of Available-for-Sale Securities, 12 Months or More | 171,503 | 180,569
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (11,116) | (17,091)
Fair Value of Available-for-Sale Securities, Total | 190,414 | 183,311
Unrealized Losses of Available-for-Sale Securities, Total | (11,248) | (17,093)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 0 | 0
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | 0 | 0
Fair Value of Held-to-Maturity Securities, 12 Months or More | 41,779 | 40,677
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (1,712) | (2,607)
Fair Value of Held-to-Maturity Securities, Total | 41,779 | 40,677
Unrealized Losses of Held-to-Maturity Securities | (1,712) | (2,607)
U.S. government-sponsored mortgage-backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 2,314 | 102,831
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (23) | (2,166)
Fair Value of Available-for-Sale Securities, 12 Months or More | 1,322,911 | 1,392,318
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (150,047) | (189,391)
Fair Value of Available-for-Sale Securities, Total | 1,325,225 | 1,495,149
Unrealized Losses of Available-for-Sale Securities, Total | (150,070) | (191,557)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 0 | 48,498
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | 0 | (861)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 72,591 | 65,573
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (2,288) | (3,501)
Fair Value of Held-to-Maturity Securities, Total | 72,591 | 114,071
Unrealized Losses of Held-to-Maturity Securities | (2,288) | (4,362)
Private mortgage-backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 0 | 9,298
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | 0 | (226)
Fair Value of Available-for-Sale Securities, 12 Months or More | 168,230 | 166,107
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (9,090) | (15,891)
Fair Value of Available-for-Sale Securities, Total | 168,230 | 175,405
Unrealized Losses of Available-for-Sale Securities, Total | (9,090) | (16,117)
Non-government-sponsored asset backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 0 | 0
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | 0 | 0
Fair Value of Available-for-Sale Securities, 12 Months or More | 106,450 | 213,838
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (2,945) | (7,551)
Fair Value of Available-for-Sale Securities, Total | 106,450 | 213,838
Unrealized Losses of Available-for-Sale Securities, Total | (2,945) | (7,551)
State and political subdivisions |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 22,859 | 28,596
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (504) | (400)
Fair Value of Available-for-Sale Securities, 12 Months or More | 771,340 | 769,860
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (66,300) | (75,531)
Fair Value of Available-for-Sale Securities, Total | 794,199 | 798,456
Unrealized Losses of Available-for-Sale Securities, Total | (66,804) | (75,931)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 22,950 | 21,493
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (483) | (297)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 994,010 | 956,578
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (79,103) | (104,797)
Fair Value of Held-to-Maturity Securities, Total | 1,016,960 | 978,071
Unrealized Losses of Held-to-Maturity Securities | (79,586) | (105,094)
Other securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 6,976 | 0
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (1,079) | 0
Fair Value of Available-for-Sale Securities, 12 Months or More | 171,574 | 164,430
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (20,573) | (28,030)
Fair Value of Available-for-Sale Securities, Total | 178,550 | 164,430
Unrealized Losses of Available-for-Sale Securities, Total | $ (21,652) | $ (28,030)

X
- References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-4 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-4 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DebtSecuritiesHeldToMaturityFairValueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-6 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-6 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-6 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for less than 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-6 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for less than 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_OtherDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |