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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 97,450	$ 105,765	$ 55,247
Other comprehensive income (loss), before tax:
Changes in unrealized gains and losses on securities available-for-sale	34,530	(16,923)	(15,142)
Changes in unrealized gains and losses on derivative hedges	0
Changes in unrealized gains and losses on derivative hedges		0	6,573
Changes in unrealized gains and losses on pension	(270)	336	(94)
Total other comprehensive income/(loss), before tax	34,260	(16,587)	(8,663)
Income taxes related to other comprehensive income (loss):
Changes in unrealized gains and losses on securities available-for-sale	(8,873)	4,421	5,610
Changes in unrealized gains and losses on derivative hedges	0
Changes in unrealized gains and losses on derivative hedges		0	(2,589)
Changes in unrealized gains and losses on pension	76	(108)	37
Total income tax (expense) benefit related to other comprehensive income (loss)	(8,797)	4,313	3,058
Total other comprehensive income/(loss)	25,463	(12,274)	(5,605)
Total comprehensive income	$ 122,913	$ 93,491	$ 49,642

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