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Investment Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Investment securities available for sale
Amortized cost	$ 3,268,037	$ 1,940,763
Gross Unrealized Gains	66,800	19,823
Gross Unrealized Losses	(4,165)	(4,539)
Fair Value	3,330,672	1,956,047
Gross realized gains	662	6,030	$ 31
Gross realized losses	612	3,319	$ 686
investment securities held-to-maturity
Investment Securities - Held to Maturity	955,542
Gross Unrealized Gains	2,764
Gross Unrealized Losses	(1,123)
Fair Value	957,183	0
Government-sponsored entities debt
Investment securities available for sale
Amortized cost	29,882	25,356
Gross Unrealized Gains	16	585
Gross Unrealized Losses	(642)
Fair Value	29,256	25,941
investment securities held-to-maturity
Investment Securities - Held to Maturity	25,000
Gross Unrealized Gains	1
Fair Value	25,001
State and municipal obligations
Investment securities available for sale
Amortized cost	502,575	204,150
Gross Unrealized Gains	17,491	5,029
Gross Unrealized Losses	(27)	(764)
Fair Value	520,039	208,415
Mortgage-backed securities
Investment securities available for sale
Amortized cost	2,722,018	1,711,257
Gross Unrealized Gains	49,153	14,209
Gross Unrealized Losses	(3,496)	(3,775)
Fair Value	2,767,675	$ 1,721,691
investment securities held-to-maturity
Investment Securities - Held to Maturity	930,542
Gross Unrealized Gains	2,763
Gross Unrealized Losses	(1,123)
Fair Value	932,182
Corporate securities.
Investment securities available for sale
Amortized cost	13,562
Gross Unrealized Gains	140
Fair Value	13,702
Mortgage-backed securities issued by private label holdings
Investment securities available for sale
Fair Value	$ 0

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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