Borrowed Funds - Summary of Borrowed Funds (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Federal Home Loan Bank advances, Amount	$ 519,260	$ 449,383
Securities sold under agreements to repurchase, Amount	71,739	61,760
Other borrowings, Amount	96,801	99,530
Borrowed funds, Amount	$ 687,800	$ 610,673
Weighted Average
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Federal Home Loan Bank advances, Weighted Average Rate	1.84%	2.15%
Securities sold under agreements to repurchase, Weighted Average Rate	0.42%	0.30%
Other borrowings, Weighted Average Rate	4.64%	5.24%
Borrowed funds, Weighted Average Rate	2.09%	2.47%