Fair Value Measurements - Recurring Level III Assets (Details) - Level III - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 39,770	$ 47,795	$ 43,679	$ 38,919
Realized and unrealized gains (losses) included in earnings	5	(7,338)	25	(1,657)
Purchase of securities	1,757	368	3,575	21,147
Maturities/calls	(74)	(61)	(5,248)	(15,574)
Unrealized gain included in other comprehensive income (loss)	3,300	1,810	7,720	5,872
Unrealized loss included in other comprehensive income (loss)	(3,344)	(466)	(8,337)	(6,599)
Ending balance	41,414	42,108	41,414	42,108
Interest Rate Lock Commitments | Interest Rate Lock Commitments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	7,338	0	1,660
Realized and unrealized gains (losses) included in earnings	0	(7,338)	0	(1,660)
Purchase of securities	0	0	0	0
Maturities/calls	0	0	0	0
Unrealized gain included in other comprehensive income (loss)	0	0	0	0
Unrealized loss included in other comprehensive income (loss)	0	0	0	0
Ending balance	0	0	0	0
Municipal Securities | Total debt securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	39,770	40,457	43,679	37,259
Realized and unrealized gains (losses) included in earnings	5	0	25	3
Purchase of securities	1,757	368	3,575	21,147
Maturities/calls	(74)	(61)	(5,248)	(15,574)
Unrealized gain included in other comprehensive income (loss)	3,300	1,810	7,720	5,872
Unrealized loss included in other comprehensive income (loss)	(3,344)	(466)	(8,337)	(6,599)
Ending balance	$ 41,414	$ 42,108	$ 41,414	$ 42,108