Fair Value Measurement and Fair Value of Financial Instruments - Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets:
Total	$ 1,074,013	$ 769,956
Equity securities, at fair value	17,180	17,368
U.S. government agencies
Assets:
Total	357,849	203,387
Mortgage-backed securities, multifamily
Assets:
Total	785	1,741
Asset-backed securities
Assets:
Total	57,543	52,584
Obligations of states and political subdivisions
Assets:
Total	21,519
Corporate bonds
Assets:
Total	114,024	50,459
Fair Value, Measurements, Recurring
Assets:
Total	1,074,013	769,956
Equity securities, at fair value	17,180	17,368
Derivative assets	105,098	43,799
Total Assets	1,196,291	831,123
Liabilities:
Derivative liabilities	105,098	43,799
Total Liabilities	105,098	43,799
Fair Value, Measurements, Recurring | U.S. government agencies
Assets:
Total	357,849	203,387
Fair Value, Measurements, Recurring | Mortgage-backed securities, residential
Assets:
Total	314,345	237,975
Fair Value, Measurements, Recurring | Collateralized mortgage obligations, residential
Assets:
Total	161,224	191,291
Fair Value, Measurements, Recurring | Mortgage-backed securities, multifamily
Assets:
Total	785	1,741
Fair Value, Measurements, Recurring | Collateralized mortgage obligations, multifamily
Assets:
Total	46,724	32,519
Fair Value, Measurements, Recurring | Asset-backed securities
Assets:
Total	57,543	52,584
Fair Value, Measurements, Recurring | Obligations of states and political subdivisions
Assets:
Total	21,519
Fair Value, Measurements, Recurring | Corporate bonds
Assets:
Total	114,024	50,459
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets:
Total	161,796	104,861
Equity securities, at fair value	0	0
Derivative assets	0	0
Total Assets	161,796	104,861
Liabilities:
Derivative liabilities	0	0
Total Liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | U.S. government agencies
Assets:
Total	161,796	104,861
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Mortgage-backed securities, residential
Assets:
Total	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Collateralized mortgage obligations, residential
Assets:
Total	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Mortgage-backed securities, multifamily
Assets:
Total	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Collateralized mortgage obligations, multifamily
Assets:
Total	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Asset-backed securities
Assets:
Total	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Obligations of states and political subdivisions
Assets:
Total	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Corporate bonds
Assets:
Total	0	0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets:
Total	912,217	665,095
Equity securities, at fair value	17,180	17,368
Derivative assets	105,098	43,799
Total Assets	1,034,495	726,262
Liabilities:
Derivative liabilities	105,098	43,799
Total Liabilities	105,098	43,799
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | U.S. government agencies
Assets:
Total	196,053	98,526
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Mortgage-backed securities, residential
Assets:
Total	314,345	237,975
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Collateralized mortgage obligations, residential
Assets:
Total	161,224	191,291
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Mortgage-backed securities, multifamily
Assets:
Total	785	1,741
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Collateralized mortgage obligations, multifamily
Assets:
Total	46,724	32,519
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Asset-backed securities
Assets:
Total	57,543	52,584
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Obligations of states and political subdivisions
Assets:
Total	21,519
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate bonds
Assets:
Total	114,024	50,459
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets:
Total	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
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | U.S. government agencies
Assets:
Total	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Mortgage-backed securities, residential
Assets:
Total	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Collateralized mortgage obligations, residential
Assets:
Total	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Mortgage-backed securities, multifamily
Assets:
Total	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Collateralized mortgage obligations, multifamily
Assets:
Total	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Asset-backed securities
Assets:
Total	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Obligations of states and political subdivisions
Assets:
Total	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate bonds
Assets:
Total	$ 0	$ 0