Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Other Intangible Assets [Abstract]

Carrying Value of Intangible Assets Subject to Amortization

	December 31, 2016
	Purchase		Accumulated		Carrying
(in thousands)	Value		Amortization		Value
Core deposit intangibles	$	190,655	$	113,436	$	77,219
Credit card and trust relationships		22,400		14,907		7,493
Merchant processing relationships		10,000		6,955		3,045
	$	223,055	$	135,298	$	87,757

	December 31, 2015
	Purchase		Accumulated		Carrying
(in thousands)	Value		Amortization		Value
Core deposit intangibles	$	190,655	$	97,026	$	93,629
Credit card and trust relationships		22,400		12,735		9,665
Trade name		11,722		11,722		—
Merchant processing relationships		10,000		5,756		4,244
	$	234,777	$	127,239	$	107,538

Aggregate Amortization Expense

	Years Ended December 31,
(in thousands)	2016		2015		2014
Aggregate amortization expense for:
Core deposit intangibles	$	16,411	$	18,031	$	19,897
Credit card and trust relationships		2,172		2,369		2,566
Value of insurance business acquired		—		—		34
Non-compete agreements		—		—		100
Trade name		—		2,388		2,605
Merchant processing relationships		1,198		1,396		1,595
	$	19,781	$	24,184	$	26,797

Estimated Amortization Expense of Other Intangible Assets

2017	$	17,815
2018		16,062
2019		13,747
2020		10,124
2021		8,452
Thereafter		21,557
	$	87,757