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Borrowed Funds - Debt Disclosure by Year (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Securities sold under repurchase agreements, maximum balance $ 115,233,000 $ 96,914,000
FHLB line of credit, maximum balance 422,000,000 451,000,000
FHLB advances, maximum balance 1,177,083,000 1,190,006,000
Securities sold under repurchase agreements, average balance 86,194,000 71,234,000
FHLB line of credit, average balance 97,853,000 325,481,000
FHLB advances, average balance $ 1,045,282,000 $ 939,916,000
Securities sold under repurchase agreements, weighted average interest rate 0.28% 0.49%
FHLB line of credit, weighted average interest rate 1.09% 2.40%
FHLB advances, weighted average interest rate 1.49% 2.11%