Restricted Stock and Stock Options - Restricted Stock Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
2012 Incentive Plan [Member] | Common and Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Nonvested outstanding, Beginning balance	10,531	12,821	15,314
Shares, Granted	18,561	42,021	27,388
Shares, Vested	(21,887)	(44,311)	(29,881)
Shares, Forfeited	(5,900)
Shares, Nonvested outstanding, Ending balance	1,305	10,531	12,821
Weighted-Average Grant-Date Fair Value per Share, Beginning balance	$ 60.92	$ 62.52	$ 60.23
Weighted-Average Grant-Date Fair Value per Share, Granted	52.35	48.08	64.36
Weighted-Average Grant-Date Fair Value per Share, Vested	53.65	49.21	63.03
Weighted-Average Grant-Date Fair Value per Share, Forfeited	50.97
Weighted-Average Grant-Date Fair Value per Share, Ending balance	$ 55.18	$ 60.92	$ 62.52
Non-Employee Director Restricted Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Nonvested outstanding, Beginning balance	11,888	5,607	5,068
Shares, Granted	9,856	12,149	5,607
Shares, Vested	(10,402)	(5,868)	(5,068)
Shares, Forfeited	(1,486)
Shares, Nonvested outstanding, Ending balance	9,856	11,888	5,607
Weighted-Average Grant-Date Fair Value per Share, Beginning balance	$ 50.47	$ 62.40	$ 69.03
Weighted-Average Grant-Date Fair Value per Share, Granted	53.26	50.41	62.40
Weighted-Average Grant-Date Fair Value per Share, Vested	50.47	61.75	69.03
Weighted-Average Grant-Date Fair Value per Share, Forfeited	55.08
Weighted-Average Grant-Date Fair Value per Share, Ending balance	$ 53.26	$ 50.47	$ 62.40
2022 Equity and Incentive Compensation Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Nonvested outstanding, Beginning balance	2,098
Shares, Granted	33,369	2,098
Shares, Vested	(419)
Shares, Nonvested outstanding, Ending balance	1,679	2,098
Weighted-Average Grant-Date Fair Value per Share, Beginning balance	$ 47.65
Weighted-Average Grant-Date Fair Value per Share, Granted		$ 47.65
Weighted-Average Grant-Date Fair Value per Share, Vested	47.65
Weighted-Average Grant-Date Fair Value per Share, Ending balance	$ 47.65	$ 47.65
2022 Equity and Incentive Compensation Plan [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Nonvested outstanding, Beginning balance	22,826
Shares, Granted	33,369	22,826
Shares, Vested	(7,989)
Shares, Forfeited	(987)
Shares, Nonvested outstanding, Ending balance	47,219	22,826
Weighted-Average Grant-Date Fair Value per Share, Beginning balance	$ 48.19
Weighted-Average Grant-Date Fair Value per Share, Granted	52.61	$ 48.19
Weighted-Average Grant-Date Fair Value per Share, Vested	48.19
Weighted-Average Grant-Date Fair Value per Share, Forfeited	51.26
Weighted-Average Grant-Date Fair Value per Share, Ending balance	$ 51.19	$ 48.19