Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Carrying Value of Intangible Assets Subject to Amortization

	December 31, 2019
	Purchase		Accumulated		Carrying
(in thousands)	Value		Amortization		Value
Core deposit intangibles	$	247,455	$	168,577	$	78,878
Credit card and trust relationships		49,962		22,448		27,514
Merchant processing relationships		10,000		9,585		415
	$	307,417	$	200,610	$	106,807

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

Aggregate Amortization Expense

	Years Ended December 31,
(in thousands)	2019		2018		2017
Core deposit intangibles	$	17,132	$	18,566	$	19,442
Credit card and trust relationships		2,883		2,682		1,975
Merchant processing relationships		829		802		1,000
	$	20,844	$	22,050	$	22,417

Estimated Amortization Expense of Other Intangible Assets

(in thousands)
2020		$	19,916
2021			16,665
2022			14,033
2023			11,557
2024			9,413
Thereafter			35,223
	$		106,807