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Loans and Allowance for Credit Losses - Schedule of Composition of Loans and Impact of Adoption (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 13,925,261	$ 13,786,479
Allowance	(114,037)	(131,388)	$ (106,380)	$ (54,619)
Net loans	13,811,224	13,655,091
Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0
Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	13,925,261	13,786,479
Allowance	(114,037)	(131,388)
Net loans	13,811,224	13,655,091
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	4,068,896	3,956,422
Allowance	(25,130)	(30,567)	(31,125)	(21,359)
Commercial | PPP Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,124,000	943,000
Commercial | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	(187,967)
Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	3,880,929	3,757,700
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	6,074,135	5,946,512
Allowance	(70,561)	(75,810)	(54,103)	(20,535)
Commercial real estate | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	(168,283)
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	5,905,852	5,774,811
BBCC
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance	(2,537)	(6,120)	(5,417)	(2,279)
BBCC | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	356,250
BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	356,250	370,423
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,203,277	2,248,422
Allowance	(10,265)	(12,608)	(9,637)	(2,299)
Residential real estate | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	2,203,277	2,248,422
Consumer credit
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	1,578,953	1,635,123
Consumer credit | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	(1,578,953)
Indirect
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	887,333	913,902
Allowance	(2,255)	(3,580)	(3,666)	(5,319)
Indirect | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	887,333
Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	887,333	913,902
Direct
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	150,471	164,807
Allowance	(665)	(855)	(822)	(1,863)
Direct | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	150,471
Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	150,471	164,807
Home equity
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	541,149	556,414
Allowance	(2,624)	(1,848)	$ (1,610)	$ (965)
Home equity | Segment Portfolio Reclassification
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	541,149
Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	541,149	556,414
Direct Finance Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 29,900	$ 32,300

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