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Loans - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Loans - Narrative (Details) - USD ($) $ in Thousands	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
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 4,763,127				$ 4,307,366				$ 4,763,127	$ 4,307,366
Net deferred fee income	16,984				8,927				16,984	8,927
Total principal balance of loans owed, net of charge-offs	4,805,596				4,351,725				4,805,596	4,351,725
Loans, including fees	61,015	$ 58,039	$ 58,409	$ 56,258	56,862	$ 56,999	$ 55,491	$ 54,398	233,721	223,750	$ 186,117
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Loans	526,327				$ 249,791				526,327	$ 249,791
Payment Protection Program (PPP) \| Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Loans	333,982								333,982
Net deferred fee income	7,212								7,212
Total principal balance of loans owed, net of charge-offs	$ 438,510								438,510
Loans, including fees									$ 7,760