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Investment Securities - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-sale |  |
Amortized Cost | $ 249,736 | $ 262,342
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 31,672 | 24,464
Estimated Fair Value | 218,064 | 237,878
Held-to-maturity |  |
Amortized Cost | 401,561 | 399,494
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 60,555 | 50,989
Estimated Fair Value | 341,006 | 348,505
Amortized Cost | 651,297 | 661,836
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 92,227 | 75,453
Estimated Fair Value | 559,070 | 586,383
U.S. Treasury and U.S. government agencies |  |
Available-for-sale |  |
Amortized Cost | 36,609 | 36,528
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,878 | 1,614
Estimated Fair Value | 34,731 | 34,914
Held-to-maturity |  |
Amortized Cost | 245,771 | 245,671
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 40,363 | 34,834
Estimated Fair Value | 205,408 | 210,837
Mortgage-backed U.S. government agencies |  |
Available-for-sale |  |
Amortized Cost | 173,060 | 185,993
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 24,416 | 19,078
Estimated Fair Value | 148,644 | 166,915
Held-to-maturity |  |
Amortized Cost | 45,374 | 50,710
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 7,614 | 6,676
Estimated Fair Value | 37,760 | 44,034
State and political subdivision obligations |  |
Available-for-sale |  |
Amortized Cost | 4,338 | 4,354
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,026 | 815
Estimated Fair Value | 3,312 | 3,539
Held-to-maturity |  |
Amortized Cost | 84,942 | 87,125
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 11,330 | 8,345
Estimated Fair Value | 73,612 | 78,780
Corporate debt securities |  |
Available-for-sale |  |
Amortized Cost | 35,729 | 35,467
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 4,352 | 2,957
Estimated Fair Value | 31,377 | 32,510
Held-to-maturity |  |
Amortized Cost | 25,474 | 15,988
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,248 | 1,134
Estimated Fair Value | $ 24,226 | $ 14,854

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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