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Loans - Activity in the Allowance for Credit Losses on Loans by Portfolio Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 248,666
Ending balance	246,835
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	72,091	$ 73,843
Credit loss, expense (reversal)	17,561	(1,965)
Charge-offs	(3,455)	(2,189)
Recoveries	829	1,203
Net charge-offs	(2,626)	(986)
Ending balance	87,026	70,892
Commercial and Industrial Total Energy Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	17,217	39,553
Credit loss, expense (reversal)	(2,044)	(5,801)
Charge-offs	(371)	(1,433)
Recoveries	620	1,153
Net charge-offs	249	(280)
Ending balance	15,422	33,472
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	144,936	134,892
Credit loss, expense (reversal)	(15,609)	8,922
Charge-offs	(702)	0
Recoveries	329	626
Net charge-offs	(373)	626
Ending balance	128,954	144,440
Total consumer real estate loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	6,585	7,926
Credit loss, expense (reversal)	(26)	(2,722)
Charge-offs	(231)	(284)
Recoveries	31	716
Net charge-offs	(200)	432
Ending balance	6,359	5,636
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	7,837	6,963
Credit loss, expense (reversal)	4,582	1,566
Charge-offs	(5,771)	(4,060)
Recoveries	2,426	2,349
Net charge-offs	(3,345)	(1,711)
Ending balance	9,074	6,818
Loans Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	248,666	263,177
Credit loss, expense (reversal)	4,464	0
Charge-offs	(10,530)	(7,966)
Recoveries	4,235	6,047
Net charge-offs	(6,295)	(1,919)
Ending balance	$ 246,835	$ 261,258

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Amount, after recoveries, of loans and leases that have been written-off.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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