Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Carrying Value of Intangible Assets Subject to Amortization

	December 31, 2021
	Purchase		Accumulated		Carrying
(in thousands)	Value		Amortization		Value
Core deposit intangibles	$	235,845	$	188,135	$	47,710
Credit card and trust relationships		49,962		27,446		22,516
	$	285,807	$	215,581	$	70,226

	December 31, 2020
	Purchase		Accumulated		Carrying
(in thousands)	Value		Amortization		Value
Core deposit intangibles	$	235,845	$	173,830	$	62,015
Credit card and trust relationships		49,962		25,085		24,877
Merchant processing relationships		10,000		10,000		—
	$	295,807	$	208,915	$	86,892

Aggregate Amortization Expense

	Years Ended December 31,
(in thousands)	2021		2020		2019
Core deposit intangibles	$	14,304	$	16,864	$	17,132
Credit card and trust relationships		2,361		2,637		2,883
Merchant processing relationships		—		415		829
	$	16,665	$	19,916	$	20,844

Estimated Amortization Expense of Other Intangible Assets

(in thousands)
2022	$	14,033
2023		11,557
2024		9,413
2025		7,985
2026		5,322
Thereafter		21,916
	$	70,226