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Short-term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Short-term Debt [Line Items]
Ending Balance	$ 721,823	$ 707,466	$ 867,943
Average Balance	$ 618,957	$ 867,391	$ 1,387,737
Average Rate	1.74%	1.01%	0.58%
Federal funds purchased
Short-term Debt [Line Items]
Ending Balance	$ 11,000	$ 0	$ 0
Average Balance	$ 8,801	$ 6,225	$ 6,887
Average Rate	2.05%	1.24%	0.60%
Borrowings from FHLB
Short-term Debt [Line Items]
Ending Balance	$ 565,000	$ 567,500	$ 748,000
Average Balance	$ 467,594	$ 710,932	$ 1,265,932
Average Rate	2.12%	1.18%	0.61%
Securities sold under agreements to repurchase
Short-term Debt [Line Items]
Ending Balance	$ 145,823	$ 139,966	$ 119,943
Average Balance	$ 142,562	$ 150,234	$ 114,918
Average Rate	0.44%	0.24%	0.23%
Maximum [Member]
Short-term Debt [Line Items]
Ending Balance	$ 811,026	$ 967,259	$ 1,530,678
Weighted Average [Member]
Short-term Debt [Line Items]
Average Rate	2.17%	1.27%	0.63%

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-Name Accounting Standards Codification
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