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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Assets
Reconciliation of Assets at Level 3 Measurement
Balance at beginning of period	$ 7,361	$ 9,561	$ 7,238	$ 11,841
Additions	7	0	7	0
Transfers into Level 3	583	0	583	0
Sales and settlements	0	0	0	(1,135)
Other comprehensive income	0	0	0	0
Amounts included in earnings - fair value adjustments	4,156	(1,817)	4,279	(2,962)
Balance at end of period	12,107	7,744	12,107	7,744
Servicing rights for SBA/USDA loans
Reconciliation of Assets at Level 3 Measurement
Balance at beginning of period	6,290	7,401	6,794	7,510
Additions	303	405	398	780
Transfers into Level 3	0	0	0	0
Sales and settlements	(34)	(188)	(341)	(551)
Other comprehensive income	0	0	0	0
Amounts included in earnings - fair value adjustments	(525)	(238)	(817)	(359)
Balance at end of period	6,034	7,380	6,034	7,380
Residential mortgage servicing rights
Reconciliation of Assets at Level 3 Measurement
Balance at beginning of period	11,059	11,447	13,565	11,877
Additions	3,217	1,228	5,332	2,091
Transfers into Level 3	0	0	0	0
Sales and settlements	(682)	(153)	(1,175)	(303)
Other comprehensive income	0	0	0	0
Amounts included in earnings - fair value adjustments	(1,102)	(1,843)	(5,230)	(2,986)
Balance at end of period	12,492	10,679	12,492	10,679
Debt Securities Available-for-Sale
Reconciliation of Assets at Level 3 Measurement
Balance at beginning of period	0	995	998	995
Additions	1,000	0	1,000	0
Transfers into Level 3	0	0	0	0
Sales and settlements	0	0	(1,000)	0
Other comprehensive income	0	0	2	0
Amounts included in earnings - fair value adjustments	0	0	0	0
Balance at end of period	1,000	995	1,000	995
Derivative Liabilities
Reconciliation of Liabilities at Level 3 Measurement
Balance at beginning of period	2,717	11,444	8,559	15,732
Additions	0	0	0	0
Transfers into Level 3	0	0	0	0
Sales and settlements	0	0	0	(2,330)
Other comprehensive income	0	0	0	0
Amounts included in earnings - fair value adjustments	(148)	(2,432)	(5,990)	(4,390)
Balance at end of period	$ 2,569	$ 9,012	$ 2,569	$ 9,012