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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Securities available-for-sale [Abstract]
Amortized Cost		$ 3,337,991		$ 3,146,023
Gross Unrealized Gains		75,677		5,275
Gross Unrealized Losses		20,233		67,612
Securities available-for-sale, at fair value		3,393,435		3,083,686
Available-for-sale, Amortized Cost [Abstract]
Due in one year or less		63,488
Due in one year to five years		16,772
Due in five years to ten years		106,774
Due after ten years		1,668,670
Mortgage-backed securities		1,318,953
Asset-backed securities		163,334
Amortized Cost		3,337,991
Available-for-sale, Fair Value [Abstract]
Due in one year or less		63,507
Due in one year to five years		16,986
Due in five years to ten years		107,322
Due after ten years		1,708,370
Mortgage-backed securities		1,334,517
Asset-backed securities		162,733
Securities available-for-sale, at fair value		3,393,435		3,083,686
Schedule of Held-to-maturity Securities [Line Items]
Available-for-sale securities transferred to Held-to-Maturity		0	$ 179,763	179,800
Net unrealized after tax loss	$ 2,200
Securities held-to-maturity [Abstract]
Amortized Cost		189,684		194,282
Gross Unrealized Gains		13,137		152
Gross Unrealized Losses		0		1,303
Securities held-to-maturity, fair value		202,821		193,131
Held-to-maturity, Amortized Cost [Abstract]
Due in one year or less		1,394
Due in one year to five years		0
Due in five years to ten years		5,775
Due after ten years		182,515
Mortgage-backed securities		0
Asset-backed securities		0
Amortized Cost		189,684		194,282
Held-to-maturity, Fair Value [Abstract]
Due in one year or less		1,394
Due in one year to five years		0
Due in five years to ten years		5,877
Due after ten years		195,550
Mortgage-backed securities		0
Asset-backed securities		0
Fair Value		202,821		193,131
U.S. Treasury securities
Securities available-for-sale [Abstract]
Amortized Cost		48,635		30,325
Gross Unrealized Gains		31		0
Gross Unrealized Losses		4		25
Securities available-for-sale, at fair value		48,662		30,300
Available-for-sale, Fair Value [Abstract]
Securities available-for-sale, at fair value		48,662		30,300
U.S. government agency securities
Securities available-for-sale [Abstract]
Amortized Cost		92,668		71,456
Gross Unrealized Gains		412		49
Gross Unrealized Losses		834		1,346
Securities available-for-sale, at fair value		92,246		70,159
Available-for-sale, Fair Value [Abstract]
Securities available-for-sale, at fair value		92,246		70,159
Mortgage-backed securities
Securities available-for-sale [Abstract]
Amortized Cost		1,318,953		1,336,469
Gross Unrealized Gains		19,229		3,110
Gross Unrealized Losses		3,665		28,634
Securities available-for-sale, at fair value		1,334,517		1,310,945
Available-for-sale, Fair Value [Abstract]
Securities available-for-sale, at fair value		1,334,517		1,310,945
State and municipal securities
Securities available-for-sale [Abstract]
Amortized Cost		1,658,734		1,259,267
Gross Unrealized Gains		54,839		1,126
Gross Unrealized Losses		13,687		30,739
Securities available-for-sale, at fair value		1,699,886		1,229,654
Available-for-sale, Fair Value [Abstract]
Securities available-for-sale, at fair value		1,699,886		1,229,654
Asset-backed securities
Securities available-for-sale [Abstract]
Amortized Cost		163,334		379,107
Gross Unrealized Gains		601		820
Gross Unrealized Losses		1,202		4,345
Securities available-for-sale, at fair value		162,733		375,582
Available-for-sale, Fair Value [Abstract]
Securities available-for-sale, at fair value		162,733		375,582
Corporate notes and other
Securities available-for-sale [Abstract]
Amortized Cost		55,667		69,399
Gross Unrealized Gains		565		170
Gross Unrealized Losses		841		2,523
Securities available-for-sale, at fair value		55,391		67,046
Available-for-sale, Fair Value [Abstract]
Securities available-for-sale, at fair value		55,391		67,046
State and municipal securities
Securities held-to-maturity [Abstract]
Amortized Cost		189,684		194,282
Gross Unrealized Gains		13,137		152
Gross Unrealized Losses		0		1,303
Securities held-to-maturity, fair value		202,821		193,131
Held-to-maturity, Amortized Cost [Abstract]
Amortized Cost		189,684		194,282
Held-to-maturity, Fair Value [Abstract]
Fair Value		$ 202,821		$ 193,131

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