Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income available to common shareholders	$ 22,148	$ 18,251	$ 41,962	$ 47,249
Unrealized gains (losses) on available-for-sale securities arising during the period	9,154	4,652	(11,086)	31,365
Reclassification adjustment for (gains) losses	(29)	6	(312)	(56)
Reclassification of unrealized gains on held-to-maturity securities to available-for-sale	0	0	0	1,562
Other comprehensive income (loss) before income taxes	9,125	4,658	(11,398)	32,871
Tax effect	(2,187)	(1,089)	2,731	(7,682)
Other comprehensive income (loss), net of tax	6,938	3,569	(8,667)	25,189
Comprehensive Income, Net of Tax	$ 29,086	$ 21,820	$ 33,295	$ 72,438