Short-term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Short-term Debt [Line Items]
Ending Balance	$ 138,315	$ 117,373	$ 201,853
Average Balance	$ 119,801	$ 142,634	$ 391,547
Average Rate	0.08%	0.49%	2.12%
Federal funds purchased
Short-term Debt [Line Items]
Ending Balance	$ 0	$ 0	$ 0
Average Balance	$ 0	$ 4,147	$ 8,069
Average Rate	0.00%	1.06%	2.53%
Borrowings from FHLB
Short-term Debt [Line Items]
Ending Balance	$ 0	$ 0	$ 136,200
Average Balance	$ 0	$ 28,252	$ 278,930
Average Rate	0.00%	1.54%	2.62%
Securities sold under agreements to repurchase
Short-term Debt [Line Items]
Ending Balance	$ 138,315	$ 117,373	$ 65,653
Average Balance	$ 119,801	$ 110,235	$ 104,548
Average Rate	0.08%	0.21%	0.75%
Maximum [Member]
Short-term Debt [Line Items]
Ending Balance	$ 138,315	$ 248,471	$ 670,831
Weighted Average [Member]
Short-term Debt [Line Items]
Average Rate	0.06%	0.10%	1.41%

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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