Cash Flow Information - Supplemental Information on Cash Flows and Noncash Transactions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Supplemental cash flow information:
Interest paid	$ 30,540	$ 6,198	$ 14,494
Federal income taxes paid	45,430	39,528	44,381
Schedule of noncash investing and financing activities:
Investment securities purchased but not settled	0	0	14,641
Restricted stock granted to officers and directors	$ 2,188	$ 1,316	$ 672