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Loans and Allowance - Narrative (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Receivables [Abstract]
Loans held for sale	$ 3,966				$ 9,037				$ 3,966	$ 9,037
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of funded loans (over) | loan									4,400
Interest income									$ 358,264	382,772	$ 342,501
Loans - allowance for loan losses	130,648				80,284				130,648	80,284	80,552	$ 75,032
Increase in allowance for loan losses									50,300
Net charge offs									8,300
Increase in net charge offs									5,200
Provision for loan losses	4,482	$ 12,544	$ 21,895	$ 19,752	500	$ 600	$ 500	$ 1,200	58,673	2,800	7,227
Increase in provision for loan losses									55,900
Loans	9,243,174				8,459,310				9,243,174	8,459,310
Loans acquired with deteriorated credit quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	6,161				13,309				6,161	13,309
PPP, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans net of deferred fees	667,100								667,100
Deferred fees	12,500								$ 12,500
Weighted-average deferred processing fee									3.09%
Interest income									$ 6,200
Deferred processing fee income									16,200
Commercial and consumer loan | Loans acquired with deteriorated credit quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - allowance for loan losses	557				124				557	124
Loans	1,300				2,800				1,300	2,800
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans - allowance for loan losses	22,815				14,569				22,815	14,569	14,322	$ 13,537
Provision for loan losses									8,573	273	$ 1,969
Loans	1,743,000				1,732,201				$ 1,743,000	$ 1,732,201
Percentage of troubled debt restructured loans									70.00%	100.00%
Mortgage loans for which formal foreclosure proceedings are in process	2,800				1,000				$ 2,800	$ 1,000
Residential | Loans acquired with deteriorated credit quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 0				$ 1,715				$ 0	$ 1,715

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