Annual report pursuant to Section 13 and 15(d)

Securities - Additional Information (Detail)

v3.22.4
Securities - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]      
Proceeds from sales of securities $ 0 $ 55,884,000 $ 495,566,000
Net gains (losses) in earnings resulting from sale of securities   (499,000) 15,712,000
Net unrealized gains (losses) recorded in comprehensive income   (100,000) $ 15,300,000
Securities available for sale 853,838,000 910,790,000  
Pledged to Secure Advances      
Debt Securities, Available-for-sale [Line Items]      
Securities available for sale $ 23,400,000 $ 34,700,000  
Minimum | U.S. Government and its Agencies      
Debt Securities, Available-for-sale [Line Items]      
Holdings of securities as percentage of share holders' equity 10.00%