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Regulatory Capital (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), actual, amount $ 819,855 $ 776,390
Total capital (to risk-weighted assets), actual, ratio 0.1439 0.1437
Total capital (to risk-weighted assets), for capital adequacy purposes, amount $ 455,931 $ 432,172
Total capital (to risk-weighted assets), For capital adequacy purposes, ratio 0.0800 0.0800
Total capital (to risk-weighted assets), required for capital1 adequacy purposes with capital buffer, amount $ 598,409 $ 567,226
Total capital (to risk-weighted assets), required for capital1 adequacy purposes with capital buffer, ratio 10.50% 10.50%
Tier 1 capital (to average assets), actual, amount $ 769,424 $ 729,835
Tier 1 capital (to average assets), actual, ratio 0.1350 0.1351
Tier 1 capital (to average assets), for capital adequacy purposes, amount $ 341,948 $ 324,129
Tier 1 capital (to average assets), for capital adequacy purpose, ratio 0.0600 0.0600
Tier 1 capital (to average assets), required for capital1 adequacy purposes with capital buffer, amount $ 484,426 $ 459,183
Tier 1 capital (to average assets), required for capital1 adequacy purposes with capital buffer, ratio 8.50% 8.50%
Common equity tier 1 capital, actual amount $ 649,071 $ 609,630
Common equity tier 1 capital, actual ratio 0.1139 0.1128
Common equity tier 1 capital, for capital adequacy purposes, amount $ 256,461 $ 243,097
Common equity tier 1 capital, for capital adequacy purpose, ratio 4.50% 4.50%
Common equity tier 1 capital (to risk-weighted assets), required for capital adequacy purposes with capital buffer, amount $ 398,939 $ 378,151
Common equity tier 1 capital (to risk-weighted assets), required for capital adequacy purposes with capital buffer, ratio 7.00% 7.00%
Tier 1 capital (to average assets), actual, amount $ 769,424 $ 729,835
Tier 1 capital (to average assets), actual, ratio 0.0987 0.1003
Tier 1 capital (to average assets), for capital adequacy purposes, amount $ 311,717 $ 291,122
Tier 1 capital (to average assets), for capital adequacy purpose, ratio 0.0400 0.0400
Tier 1 capital (to average assets), required for capital1 adequacy purposes with capital buffer, amount $ 311,717 $ 291,122
Tier 1 capital (to average assets), required for capital1 adequacy purposes with capital buffer, ratio 4.00% 4.00%
Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), actual, amount $ 744,803 $ 726,339
Total capital (to risk-weighted assets), actual, ratio 0.1311 0.1359
Total capital (to risk-weighted assets), for capital adequacy purposes, amount $ 454,401 $ 427,456
Total capital (to risk-weighted assets), For capital adequacy purposes, ratio 0.0800 0.0800
Total capital (to risk-weighted assets), required for capital1 adequacy purposes with capital buffer, amount $ 596,401 $ 561,036
Total capital (to risk-weighted assets), required for capital1 adequacy purposes with capital buffer, ratio 10.50% 10.50%
Total capital (to risk-weighted assets), for well capitalized purpose, amount $ 568,001 $ 534,320
Total capital (to risk-weighted assets), for well capitalized purpose, ratio 0.1000 0.1000
Tier 1 capital (to average assets), actual, amount $ 694,372 $ 679,784
Tier 1 capital (to average assets), actual, ratio 0.1222 0.1272
Tier 1 capital (to average assets), for capital adequacy purposes, amount $ 340,801 $ 320,592
Tier 1 capital (to average assets), for capital adequacy purpose, ratio 0.0600 0.0600
Tier 1 capital (to average assets), required for capital1 adequacy purposes with capital buffer, amount $ 482,801 $ 454,172
Tier 1 capital (to average assets), required for capital1 adequacy purposes with capital buffer, ratio 8.50% 8.50%
Tier 1 capital (to average assets), for well capitalized purpose, amount $ 454,401 $ 427,456
Tier 1 capital (to average assets), for well capitalized purposes, ratio 0.0800 0.0800
Common equity tier 1 capital, actual amount $ 694,372 $ 679,784
Common equity tier 1 capital, actual ratio 0.1222 0.1272
Common equity tier 1 capital, for capital adequacy purposes, amount $ 255,600 $ 240,444
Common equity tier 1 capital, for capital adequacy purpose, ratio 4.50% 4.50%
Common equity tier 1 capital (to risk-weighted assets), required for capital adequacy purposes with capital buffer, amount $ 397,601 $ 374,024
Common equity tier 1 capital (to risk-weighted assets), required for capital adequacy purposes with capital buffer, ratio 7.00% 7.00%
Common equity tier 1 capital, for well capitalized purpose, amount $ 369,201 $ 347,308
Common equity tier 1 capital, for well capitalized purposes, ratio 6.50% 6.50%
Tier 1 capital (to average assets), actual, amount $ 694,372 $ 679,784
Tier 1 capital (to average assets), actual, ratio 0.0877 0.0889
Tier 1 capital (to average assets), for capital adequacy purposes, amount $ 316,646 $ 305,996
Tier 1 capital (to average assets), for capital adequacy purpose, ratio 0.0400 0.0400
Tier 1 capital (to average assets), required for capital1 adequacy purposes with capital buffer, amount $ 316,646 $ 305,999
Tier 1 capital (to average assets), required for capital1 adequacy purposes with capital buffer, ratio 4.00% 4.00%
Tier 1 capital (to average assets), for well capitalized purpose, amount $ 395,808 $ 382,495
Tier 1 capital (to average assets), for well capitalized purposes, ratio 0.0500 0.0500