Fair Value Measurement and Fair Value of Financial Instruments - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets:
Fair Value	$ 946,282	$ 1,054,312
Equity securities, at fair value	17,697	17,283
Fair Value, Measurements, Recurring
Assets:
Fair Value	946,282	1,054,312
Equity securities, at fair value	17,697	17,283
Derivative assets	87,566	97,848
Total Assets	1,051,545	1,169,443
Liabilities:
Derivative liabilities	87,570	97,848
Total Liabilities	87,570	97,848
Quoted Prices in Active  Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets:
Fair Value	147,484	162,438
Equity securities, at fair value	0	0
Derivative assets	0	0
Total Assets	147,484	162,438
Liabilities:
Derivative liabilities	0	0
Total Liabilities	0	0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets:
Fair Value	798,798	891,874
Equity securities, at fair value	17,697	17,283
Derivative assets	87,566	97,848
Total Assets	904,061	1,007,005
Liabilities:
Derivative liabilities	87,570	97,848
Total Liabilities	87,570	97,848
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets:
Fair Value	0	0
Equity securities, at fair value	0	0
Derivative assets	0	0
Total Assets	0	0
Liabilities:
Derivative liabilities	0	0
Total Liabilities	0	0
U.S. Treasury and U.S. government agencies
Assets:
Fair Value	319,769	355,639
U.S. Treasury and U.S. government agencies | Fair Value, Measurements, Recurring
Assets:
Fair Value	319,769	355,639
U.S. Treasury and U.S. government agencies | Quoted Prices in Active  Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets:
Fair Value	147,484	162,438
U.S. Treasury and U.S. government agencies | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets:
Fair Value	172,285	193,201
U.S. Treasury and U.S. government agencies | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets:
Fair Value	0	0
Mortgage-backed securities, residential | Fair Value, Measurements, Recurring
Assets:
Fair Value	286,417	310,613
Mortgage-backed securities, residential | Quoted Prices in Active  Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets:
Fair Value	0	0
Mortgage-backed securities, residential | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets:
Fair Value	286,417	310,613
Mortgage-backed securities, residential | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets:
Fair Value	0	0
Collateralized mortgage obligations, residential | Fair Value, Measurements, Recurring
Assets:
Fair Value	137,070	154,058
Collateralized mortgage obligations, residential | Quoted Prices in Active  Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets:
Fair Value	0	0
Collateralized mortgage obligations, residential | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets:
Fair Value	137,070	154,058
Collateralized mortgage obligations, residential | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets:
Fair Value	0	0
Mortgage-backed securities, multifamily
Assets:
Fair Value	676	785
Mortgage-backed securities, multifamily | Fair Value, Measurements, Recurring
Assets:
Fair Value	676	785
Mortgage-backed securities, multifamily | Quoted Prices in Active  Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets:
Fair Value	0	0
Mortgage-backed securities, multifamily | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets:
Fair Value	676	785
Mortgage-backed securities, multifamily | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets:
Fair Value	0	0
Collateralized mortgage obligations, multifamily | Fair Value, Measurements, Recurring
Assets:
Fair Value	42,496	46,333
Collateralized mortgage obligations, multifamily | Quoted Prices in Active  Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets:
Fair Value	0	0
Collateralized mortgage obligations, multifamily | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets:
Fair Value	42,496	46,333
Collateralized mortgage obligations, multifamily | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets:
Fair Value	0	0
Asset-backed securities
Assets:
Fair Value	43,693	52,395
Asset-backed securities | Fair Value, Measurements, Recurring
Assets:
Fair Value	43,693	52,395
Asset-backed securities | Quoted Prices in Active  Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets:
Fair Value	0	0
Asset-backed securities | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets:
Fair Value	43,693	52,395
Asset-backed securities | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets:
Fair Value	0	0
Obligations of states and political subdivisions
Assets:
Fair Value	19,128	21,122
Obligations of states and political subdivisions | Fair Value, Measurements, Recurring
Assets:
Fair Value	19,128	21,122
Obligations of states and political subdivisions | Quoted Prices in Active  Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets:
Fair Value	0	0
Obligations of states and political subdivisions | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets:
Fair Value	19,128	21,122
Obligations of states and political subdivisions | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets:
Fair Value	0	0
Corporate debt securities
Assets:
Fair Value	97,033	113,367
Corporate debt securities | Fair Value, Measurements, Recurring
Assets:
Fair Value	97,033	113,367
Corporate debt securities | Quoted Prices in Active  Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets:
Fair Value	0	0
Corporate debt securities | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets:
Fair Value	97,033	113,367
Corporate debt securities | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets:
Fair Value	$ 0	$ 0