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Investment Securities - Schedule of Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Held-to-maturity Securities, Amortized Cost    
Within one year $ 0 $ 450
After one but within five years 88,242 87,418
After five years through ten years 304,952 262,072
After ten years 541,948 622,267
Total 935,142 972,207
Held-to-maturity Securities, Fair Value    
Within one year 0 446
After one but within five years 83,291 83,663
After five years through ten years 247,742 222,280
After ten years 452,183 538,850
Total 783,216 845,239
Available-for-sale Securities, Amortized Cost    
Within one year 25,103 1,254
After one but within five years 327,723 335,813
After five years through ten years 99,406 185,997
After ten years 302,806 369,541
Total 755,038 892,605
Available-for-sale Securities, Fair Value    
Within one year 24,205 1,239
After one but within five years 297,206 307,843
After five years through ten years 85,685 166,273
After ten years 251,719 326,741
Total $ 658,815 $ 802,096