Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Other Intangible Assets [Abstract]

Carrying Value of Intangible Assets Subject to Amortization

	December 31, 2018
	Purchase		Accumulated		Carrying
(in thousands)	Value		Amortization		Value
Core deposit intangibles	$	215,955	$	151,446	$	64,509
Customer relationships		49,962		19,564		30,398
Merchant processing relationship		10,000		8,756		1,244
	$	275,917	$	179,766	$	96,151

	December 31, 2017
	Purchase		Accumulated		Carrying
(in thousands)	Value		Amortization		Value
Core deposit intangibles	$	215,955	$	132,878	$	83,077
Customer relationships		22,400		16,882		5,518
Merchant processing relationship		10,000		7,955		2,045
	$	248,355	$	157,715	$	90,640

Aggregate Amortization Expense

	Years Ended December 31,
(in thousands)	2018		2017		2016
Core deposit intangibles	$	18,566	$	19,442	$	16,411
Customer relationships		2,682		1,975		2,172
Merchant processing relationship		802		1,000		1,198
	$	22,050	$	22,417	$	19,781

Estimated Amortization Expense of Other Intangible Assets

(in thousands)
2019	$	19,859
2020		15,924
2021		12,953
2022		10,599
2023		8,401
Thereafter		28,415
	$	96,151