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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	$ 13,925,261	$ 13,786,479
Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	65,392	69,967
Current	13,859,869	13,716,512
Total loans	13,925,261	13,786,479
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	4,068,896	3,956,422
Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	6,645	5,741
Current	3,874,284	3,751,959
Total loans	3,880,929	3,757,700
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	6,074,135	5,946,512
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	35,700	28,287
Current	5,870,152	5,746,524
Total loans	5,905,852	5,774,811
BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	273	1,837
Current	355,977	368,586
Total loans	356,250	370,423
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	2,203,277	2,248,422
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	16,008	22,601
Current	2,187,269	2,225,821
Total loans	2,203,277	2,248,422
Indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	887,333	913,902
Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	3,068	6,674
Current	884,265	907,228
Total loans	887,333	913,902
Direct
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	150,471	164,807
Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,087	1,712
Current	149,384	163,095
Total loans	150,471	164,807
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	541,149	556,414
Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,611	3,115
Current	538,538	553,299
Total loans	541,149	556,414
30-59 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	18,012	23,447
30-59 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	3,141	2,977
30-59 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,586	887
30-59 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	103	894
30-59 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	9,067	11,639
30-59 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2,124	5,222
30-59 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	639	753
30-59 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	352	1,075
60-89 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,416	6,840
60-89 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	0	664
60-89 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	159	128
60-89 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	84	882
60-89 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	217	3,296
60-89 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	475	960
60-89 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	134	533
60-89 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	347	377
Past Due 90 Days or More | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	45,964	39,680
Past Due 90 Days or More | Commercial | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	3,504	2,100
Past Due 90 Days or More | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	32,955	27,272
Past Due 90 Days or More | BBCC | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	86	61
Past Due 90 Days or More | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	6,724	7,666
Past Due 90 Days or More | Indirect | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	469	492
Past Due 90 Days or More | Direct | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	314	426
Past Due 90 Days or More | Home equity | Segment Portfolio Reclassification, Adjusted Balance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 1,912	$ 1,663

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