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Parent Company Only Financial Statements - Condensed Statements of Cash Flows (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]                      
Net income $ 16,834,000 $ 18,326,000 $ 12,221,000 $ 4,109,000 $ 13,569,000 $ 11,565,000 $ 10,137,000 $ 9,999,000 $ 51,490,000 $ 45,270,000 $ 47,943,000
Depreciation, amortization and accretion, net                 14,449,000 11,721,000 10,842,000
Increase in other assets                 (13,719,000) (2,045,000) (4,680,000)
Increase in other liabilities                 5,463,000 5,713,000 3,282,000
Net cash provided by operating activities                 69,596,000 63,541,000 62,828,000
Net cash from business acquisition                 27,061,000 0 0
Net cash used in investing activities                 (482,499,000) (562,422,000) (32,072,000)
Repayment of short-term debt                 0 (5,000,000) 0
Proceeds from short-term debt                 0 5,000,000 0
Repayment of long-term debt                 0 0 (7,724,000)
Proceeds from issuance of common stock                 1,937,000 610,000 655,000
Payment to repurchase common stock                 (326,000) (213,000) (1,293,000)
Direct expenses related to capital transactions                 (206,000) 0 0
Dividends paid on common stock                 (14,721,000) (12,814,000) (11,863,000)
Net cash provided by (used in) financing activities                 164,224,000 831,082,000 (87,076,000)
Increase (decrease) in cash and cash equivalents                 (248,679,000) 332,201,000 (56,320,000)
Cash and cash equivalents at beginning of period       417,281,000       85,080,000 417,281,000 85,080,000 141,400,000
Cash and cash equivalents at end of period 168,602,000       417,281,000       168,602,000 417,281,000 85,080,000
Parent Company [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Net income                 51,490,000 45,270,000 47,943,000
Depreciation, amortization and accretion, net                 350,000 104,000 125,000
Dividends received from subsidiary                 28,075,000 29,663,000 38,688,000
Equity in undistributed earnings of subsidiaries                 (30,380,000) (19,030,000) (12,479,000)
Increase in other assets                 (206,880,000) (30,121,000) (39,042,000)
Increase in other liabilities                 1,760,000 1,349,000 (17,104,000)
Net cash provided by operating activities                 (155,585,000) 27,235,000 18,131,000
Investment in subsidiary                 0 (700,000) (343,000)
Net cash from business acquisition                 30,968,000 0 310,000
Net cash used in investing activities                 30,968,000 (700,000) (33,000)
Repayment of short-term debt                 0 (5,000,000) 0
Proceeds from short-term debt                 0 5,000,000 0
Repayment of long-term debt                 0 0 (10,310,000)
Issuance of subordinated debt                 0 94,253,000 0
Proceeds from issuance of common stock                 46,128,000 610,000 589,000
Payment to repurchase common stock                 (326,000) (213,000) (1,293,000)
Direct expenses related to capital transactions                 (206,000) 0 0
Dividends paid on common stock                 (14,721,000) (12,814,000) (11,863,000)
Net cash provided by (used in) financing activities                 30,875,000 81,836,000 (22,877,000)
Increase (decrease) in cash and cash equivalents                 (93,742,000) 108,371,000 (4,779,000)
Cash and cash equivalents at beginning of period       $ 122,163,000       $ 13,792,000 122,163,000 13,792,000 18,571,000
Cash and cash equivalents at end of period $ 28,421,000       $ 122,163,000       $ 28,421,000 $ 122,163,000 $ 13,792,000