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Investment Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
investment securities held-to-maturity
Investment Securities - Held to Maturity	$ 1,214,313		$ 955,542
Gross Unrealized Gains	44		2,764
Gross Unrealized Losses	(33,595)		(1,123)
Fair Value	1,180,762		957,183
Investment securities available for sale
Amortized cost	3,892,645		3,268,037
Gross Unrealized Gains	44,490		66,800
Gross Unrealized Losses	(45,645)		(4,165)
Fair Value	3,891,490		3,330,672
Net realized gain (loss)	0	$ 0
U.S. Government agencies
investment securities held-to-maturity
Investment Securities - Held to Maturity	49,988		25,000
Gross Unrealized Gains			1
Gross Unrealized Losses	(1,919)
Fair Value	48,069		25,001
Investment securities available for sale
Amortized cost	25,000		29,882
Gross Unrealized Gains			16
Gross Unrealized Losses	(1,447)		(642)
Fair Value	23,553		29,256
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
investment securities held-to-maturity
Investment Securities - Held to Maturity	749,291		632,269
Gross Unrealized Gains			1,827
Gross Unrealized Losses	(19,340)		(1,032)
Fair Value	729,951		633,064
Investment securities available for sale
Amortized cost	1,560,744		1,351,506
Gross Unrealized Gains	9,607		16,657
Gross Unrealized Losses	(21,669)		(1,031)
Fair Value	1,548,682		1,367,132
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises
investment securities held-to-maturity
Investment Securities - Held to Maturity	99,326		75,767
Gross Unrealized Gains			405
Gross Unrealized Losses	(4,627)
Fair Value	94,699		76,172
Investment securities available for sale
Amortized cost	682,412		739,797
Gross Unrealized Gains	14,441		16,579
Gross Unrealized Losses	(6,303)		(825)
Fair Value	690,550		755,551
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
investment securities held-to-maturity
Investment Securities - Held to Maturity	250,708		174,506
Gross Unrealized Gains	44		300
Gross Unrealized Losses	(5,878)		(91)
Fair Value	244,874		174,715
Investment securities available for sale
Amortized cost	581,776		229,219
Gross Unrealized Gains	7,021		10,939
Gross Unrealized Losses	(8,418)		(50)
Fair Value	580,379		240,108
State and municipal obligations
Investment securities available for sale
Amortized cost	589,954		502,575
Gross Unrealized Gains	10,510		17,491
Gross Unrealized Losses	(4,361)		(27)
Fair Value	596,103		520,039
Small Business Administration loan-backed securities
investment securities held-to-maturity
Investment Securities - Held to Maturity	65,000		48,000
Gross Unrealized Gains			231
Gross Unrealized Losses	(1,831)
Fair Value	63,169		48,231
Investment securities available for sale
Amortized cost	439,210		401,496
Gross Unrealized Gains	2,741		4,978
Gross Unrealized Losses	(3,414)		(1,590)
Fair Value	438,537		404,884
Corporate securities.
Investment securities available for sale
Amortized cost	13,549		13,562
Gross Unrealized Gains	170		140
Gross Unrealized Losses	(33)
Fair Value	$ 13,686		$ 13,702

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- 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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