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Securities - Schedule of Available-for-Sales Securities Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost |  |
Total | $ 875,799 | $ 967,461
Mortgage-backed securities | 812,252 | 864,330
Amortized Cost | 1,688,051 | 1,831,791
Fair Value |  |
Total | 775,926 | 856,077
Mortgage-backed securities | 692,077 | 738,890
Fair Value | 1,468,003 | 1,594,967
Available-for-sale securities |  |
Amortized Cost |  |
Due in one year or less | 47,677 | 50,922
Due after one year through five years | 514,770 | 508,880
Due after five years through ten years | 269,157 | 367,743
Due after ten years | 44,195 | 39,916
Fair Value |  |
Due in one year or less | 46,893 | 50,269
Due after one year through five years | 461,320 | 459,721
Due after five years through ten years | 230,292 | 314,408
Due after ten years | $ 37,421 | $ 31,679

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 + Details
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