Assets and Liabilities Measured at Fair Value - Reconciliation for measurements at fair value on a recurring basis using significant unobservable inputs (Details) - Recurring - Level 3 - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Assets
Reconciliation of Assets at Level 3 Measurement
Balance at beginning of period	$ 12,107	$ 7,744	$ 7,238	$ 11,841
Additions	99	0	106	0
Transfers into Level 3			583	0
Sales and settlements	0	0	0	(1,135)
Other comprehensive income	0	0	0	0
Amounts included in earnings - fair value adjustments	592	(1,501)	4,871	(4,463)
Balance at end of period	12,798	6,243	12,798	6,243
Servicing rights for SBA/USDA loans
Reconciliation of Assets at Level 3 Measurement
Balance at beginning of period	6,034	7,380	6,794	7,510
Additions	296	486	694	1,266
Transfers into Level 3			0	0
Sales and settlements	(100)	(286)	(441)	(837)
Other comprehensive income	0	0	0	0
Amounts included in earnings - fair value adjustments	531	(334)	(286)	(693)
Balance at end of period	6,761	7,246	6,761	7,246
Residential mortgage servicing rights
Reconciliation of Assets at Level 3 Measurement
Balance at beginning of period	12,492	10,679	13,565	11,877
Additions	3,055	1,789	8,387	3,880
Transfers into Level 3			0	0
Sales and settlements	(723)	(416)	(1,898)	(719)
Other comprehensive income	0	0	0	0
Amounts included in earnings - fair value adjustments	(457)	(963)	(5,687)	(3,949)
Balance at end of period	14,367	11,089	14,367	11,089
Debt Securities Available-for-Sale
Reconciliation of Assets at Level 3 Measurement
Balance at beginning of period	1,000	995	998	995
Additions	750	0	1,750	0
Transfers into Level 3			0	0
Sales and settlements	0	0	(1,000)	0
Other comprehensive income	0	3	2	3
Amounts included in earnings - fair value adjustments	0	0	0	0
Balance at end of period	1,750	998	1,750	998
Derivative Liabilities
Reconciliation of Liabilities at Level 3 Measurement
Balance at beginning of period	2,569	9,012	8,559	15,732
Additions	0	0	0	0
Transfers into Level 3			0	0
Sales and settlements	0	0	0	(2,330)
Other comprehensive income	0	0	0	0
Amounts included in earnings - fair value adjustments	(87)	(2,299)	(6,077)	(6,689)
Balance at end of period	$ 2,482	$ 6,713	$ 2,482	$ 6,713