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Investment Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
investment securities held-to-maturity
Investment Securities - Held to Maturity	$ 1,189,265,000		$ 1,189,265,000		$ 955,542,000
Gross Unrealized Gains	56,000		56,000		2,764,000
Gross Unrealized Losses	(20,929,000)		(20,929,000)		(1,123,000)
Fair Value	1,168,392,000		1,168,392,000		957,183,000
Investment securities available for sale
Amortized cost	4,337,295,000		4,337,295,000		3,268,037,000
Gross Unrealized Gains	57,822,000		57,822,000		66,800,000
Gross Unrealized Losses	(25,958,000)		(25,958,000)		(4,165,000)
Fair Value	4,369,159,000		4,369,159,000		3,330,672,000
Gross realized gains	69,000
Gross realized losses			33,000
Net realized gain (loss)		$ 0	36,000	$ 0
U.S. Government agencies
investment securities held-to-maturity
Investment Securities - Held to Maturity	49,988,000		49,988,000		25,000,000
Gross Unrealized Gains					1,000
Gross Unrealized Losses	(937,000)		(937,000)
Fair Value	49,051,000		49,051,000		25,001,000
Investment securities available for sale
Amortized cost	49,300,000		49,300,000		29,882,000
Gross Unrealized Gains					16,000
Gross Unrealized Losses	(1,163,000)		(1,163,000)		(642,000)
Fair Value	48,137,000		48,137,000		29,256,000
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
investment securities held-to-maturity
Investment Securities - Held to Maturity	728,027,000		728,027,000		632,269,000
Gross Unrealized Gains					1,827,000
Gross Unrealized Losses	(13,263,000)		(13,263,000)		(1,032,000)
Fair Value	714,764,000		714,764,000		633,064,000
Investment securities available for sale
Amortized cost	1,669,659,000		1,669,659,000		1,351,506,000
Gross Unrealized Gains	9,990,000		9,990,000		16,657,000
Gross Unrealized Losses	(13,522,000)		(13,522,000)		(1,031,000)
Fair Value	1,666,127,000		1,666,127,000		1,367,132,000
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises
investment securities held-to-maturity
Investment Securities - Held to Maturity	97,164,000		97,164,000		75,767,000
Gross Unrealized Gains					405,000
Gross Unrealized Losses	(2,457,000)		(2,457,000)
Fair Value	94,707,000		94,707,000		76,172,000
Investment securities available for sale
Amortized cost	657,315,000		657,315,000		739,797,000
Gross Unrealized Gains	13,218,000		13,218,000		16,579,000
Gross Unrealized Losses	(3,756,000)		(3,756,000)		(825,000)
Fair Value	666,777,000		666,777,000		755,551,000
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises
investment securities held-to-maturity
Investment Securities - Held to Maturity	249,933,000		249,933,000		174,506,000
Gross Unrealized Gains	56,000		56,000		300,000
Gross Unrealized Losses	(3,950,000)		(3,950,000)		(91,000)
Fair Value	246,039,000		246,039,000		174,715,000
Investment securities available for sale
Amortized cost	805,707,000		805,707,000		229,219,000
Gross Unrealized Gains	11,476,000		11,476,000		10,939,000
Gross Unrealized Losses	(4,570,000)		(4,570,000)		(50,000)
Fair Value	812,613,000		812,613,000		240,108,000
State and municipal obligations
Investment securities available for sale
Amortized cost	677,226,000		677,226,000		502,575,000
Gross Unrealized Gains	17,289,000		17,289,000		17,491,000
Gross Unrealized Losses	(1,387,000)		(1,387,000)		(27,000)
Fair Value	693,128,000		693,128,000		520,039,000
Small Business Administration loan-backed securities
investment securities held-to-maturity
Investment Securities - Held to Maturity	64,153,000		64,153,000		48,000,000
Gross Unrealized Gains					231,000
Gross Unrealized Losses	(322,000)		(322,000)
Fair Value	63,831,000		63,831,000		48,231,000
Investment securities available for sale
Amortized cost	464,553,000		464,553,000		401,496,000
Gross Unrealized Gains	5,492,000		5,492,000		4,978,000
Gross Unrealized Losses	(1,560,000)		(1,560,000)		(1,590,000)
Fair Value	468,485,000		468,485,000		404,884,000
Corporate securities.
Investment securities available for sale
Amortized cost	13,535,000		13,535,000		13,562,000
Gross Unrealized Gains	357,000		357,000		140,000
Fair Value	$ 13,892,000		$ 13,892,000		$ 13,702,000

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