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Parent Company Only Financial Statements - Condensed Statements of Cash Flows (Details) - USD ($)
 3 Months Ended 12 Months Ended
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
Condensed Financial Statements, Captions [Line Items]                      
Net income $ 13,569,000 $ 11,565,000 $ 10,137,000 $ 9,999,000 $ 11,976,000 $ 11,670,000 $ 10,981,000 $ 13,316,000 $ 45,270,000 $ 47,943,000 $ 36,600,000
Depreciation, amortization and accretion, net                 11,721,000 10,842,000 7,881,000
Increase in other assets                 (2,045,000) (4,680,000) (4,266,000)
Increase in other liabilities                 5,713,000 3,282,000 (7,846,000)
Net cash provided by operating activities                 63,541,000 62,828,000 42,175,000
Net cash from business acquisition                 0 0 56,389,000
Net cash used in investing activities                 (562,422,000) (32,072,000) (10,961,000)
Repayment of short-term debt                 (5,000,000) 0 0
Proceeds from short-term debt                 5,000,000 0 0
Repayment of long-term debt                 0 (7,724,000) (10,313,000)
Proceeds from issuance of common stock                 610,000 655,000 36,645,000
Payment to repurchase common stock                 (213,000) (1,293,000) (138,000)
Direct expenses related to capital transactions                 0 0 (2,309,000)
Dividends paid on common stock                 (12,814,000) (11,863,000) (8,792,000)
Net cash provided by (used in) financing activities                 831,082,000 (87,076,000) 21,307,000
Increase (decrease) in cash and cash equivalents                 332,201,000 (56,320,000) 52,521,000
Cash and cash equivalents at beginning of period       85,080,000       141,400,000 85,080,000 141,400,000 88,879,000
Cash and cash equivalents at end of period 417,281,000       85,080,000       417,281,000 85,080,000 141,400,000
Parent Company [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Net income                 45,270,000 47,943,000 36,600,000
Depreciation, amortization and accretion, net                 104,000 125,000 90,000
Dividends received from subsidiary                 29,663,000 38,688,000 21,694,000
Equity in undistributed earnings of subsidiaries                 (19,030,000) (12,479,000) (18,885,000)
Increase in other assets                 (30,121,000) (39,042,000) (1,645,000)
Increase in other liabilities                 1,349,000 (17,104,000) 79,000
Net cash provided by operating activities                 27,235,000 18,131,000 37,933,000
Investment in subsidiary                 (700,000) (343,000) (13,430,000)
Net cash from business acquisition                 0 310,000 (29,321,000)
Net cash used in investing activities                 (700,000) (33,000) (42,751,000)
Repayment of short-term debt                 (5,000,000) 0 0
Proceeds from short-term debt                 5,000,000 0 0
Repayment of long-term debt                 0 (10,310,000) (10,313,000)
Issuance of subordinated debt                 94,253,000 0 0
Proceeds from issuance of common stock                 610,000 589,000 36,645,000
Payment to repurchase common stock                 (213,000) (1,293,000) (138,000)
Direct expenses related to capital transactions                 0 0 (2,309,000)
Dividends paid on common stock                 (12,814,000) (11,863,000) (8,792,000)
Net cash provided by (used in) financing activities                 81,836,000 (22,877,000) 15,093,000
Increase (decrease) in cash and cash equivalents                 108,371,000 (4,779,000) 10,275,000
Cash and cash equivalents at beginning of period       $ 13,792,000       $ 18,571,000 13,792,000 18,571,000 8,296,000
Cash and cash equivalents at end of period $ 122,163,000       $ 13,792,000       $ 122,163,000 $ 13,792,000 $ 18,571,000