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Selected Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Oct. 21, 2020
Jul. 22, 2020
Apr. 29, 2020
Jan. 22, 2020
Oct. 23, 2019
Jul. 24, 2019
Apr. 24, 2019
Jan. 23, 2019
Oct. 24, 2018
Jul. 24, 2018
Apr. 25, 2018
Jan. 24, 2018
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                                              
Interest income                         $ 54,677 $ 52,563 $ 53,994 $ 53,086 $ 53,943 $ 54,884 $ 55,216 $ 53,807 $ 214,320 $ 217,850 $ 199,406
Interest expense                         2,222 2,885 3,681 4,535 4,828 4,641 4,680 4,019 13,323 18,168 12,413
Net interest income                         52,455 49,678 50,313 48,551 49,115 50,243 50,536 49,788 200,997 199,682 186,993
Provision for credit losses                         (3,133) 2,730 28,563 7,946         36,106 4,311 5,129
Provision for credit losses                                 1,558 466 1,367 920 35,433 4,311 5,129
Net interest income after provision for credit losses                         55,588 46,948 21,750 40,605 47,557 49,777 49,169 48,868 164,891 195,371 181,864
Noninterest income                         11,285 8,210 8,248 9,486 9,011 8,458 7,564 7,429 37,229 32,462 31,618
Noninterest expense                         38,562 36,045 37,073 37,260 35,997 36,719 37,547 36,525 148,940 146,788 149,187
Income before income taxes                         28,311 19,113 (7,075) 12,831 20,571 21,516 19,186 19,772 53,180 81,045 64,295
Income tax expense (benefit)                         4,429 2,477 (936) 640 3,445 3,621 3,202 3,220 6,610 13,488 11,238
Net income                         $ 23,882 $ 16,636 $ (6,139) $ 12,191 $ 17,126 $ 17,895 $ 15,984 $ 16,552 $ 46,570 $ 67,557 $ 53,057
Basic earnings per common share (in usd per share)                         $ 0.66 $ 0.46 $ (0.17) $ 0.34 $ 0.47 $ 0.49 $ 0.43 $ 0.45 $ 1.29 $ 1.84 $ 1.49
Diluted earnings per common share (in usd per share)                         0.66 0.46 (0.17) 0.34 0.47 0.48 0.43 0.45 1.29 1.83 1.49
Cash dividends declared on common stock (in usd per share) $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.19 $ 0.19 $ 0.18 $ 0.18 $ 0.17 $ 0.15 $ 0.15 $ 0.15 $ 0.20 $ 0.20 $ 0.20 $ 0.20 $ 0.29 $ 0.19 $ 0.18 $ 0.18 $ 0.80 $ 0.84 $ 0.72