Quarterly report pursuant to Section 13 or 15(d)

Deposits - Scheduled Maturities of Time Deposits (Detail)

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Deposits - Scheduled Maturities of Time Deposits (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Restricted Cash And Cash Equivalents Items [Line Items]    
2021 $ 864,090  
2022 281,488 $ 1,122,132
2023 29,940 130,148
2024 15,790 23,685
2024   5,382
2025 and thereafter 2,704  
2025 and thereafter   2,352
Total 1,194,012 1,283,699
Time Deposits of $250,000 or More    
Restricted Cash And Cash Equivalents Items [Line Items]    
2021 244,254  
2022 55,539 296,455
2023 806 14,315
2024   804
2025 and thereafter 264  
2025 and thereafter   264
Total 300,863 311,838
Other Time Deposits    
Restricted Cash And Cash Equivalents Items [Line Items]    
2021 619,836  
2022 225,949 825,677
2023 29,134 115,832
2024 15,790 22,881
2024   5,382
2025 and thereafter 2,440  
2025 and thereafter   2,089
Total $ 893,149 $ 971,861