Fair Value Measurements - Fair Value Level 3 on recurring basis (Details) - Level 3 - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest rate lock commitments with customers
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 557	$ 503
Purchases and Issuances	7,411	1,931
Sales and Settlements	(3,677)	(1,748)
Transfers In		0
Ending Balance	4,291	686
Net change in fair value for gains/(losses) relating to items held at end of period included in income	$ 3,734	183
Net change in fair value for gains/(losses) relating to items held at end of period included in other comprehensive		$ 0
Fair Value, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Income [Extensible List]	Noninterest Income, Other	Noninterest Income, Other
Individual forward sale commitments with investors
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ (195)	$ (34)
Purchases and Issuances	(531)	(162)
Sales and Settlements	545	100
Ending Balance	(181)	(96)
Net change in fair value for gains/(losses) relating to items held at end of period included in income	$ 14	$ (62)
Fair Value, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Income [Extensible List]	Noninterest Income, Other	Noninterest Income, Other
Securities available-for-sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 1,162
Purchases and Issuances	12
Sales and Settlements	(3)
Ending Balance	1,171
Net change in fair value for gains/(losses) relating to items held at end of period included in other comprehensive	$ 12