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Investment Securities (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Investment Securities Information [Line Items]          
Proceeds from sales of AFS investment securities $ 0 $ 327,000 $ 0 $ 1,061,000  
Debt Instrument, Collateral Amount 1,800,000,000   1,800,000,000   $ 2,300,000,000
Interest receivable 159,185,000   159,185,000   144,449,000
Debt Securities, Held-to-maturity, Nonaccrual, Interest Income     0   0
Debt Securities, Held to Maturity, Past Due 0   0   0
Held to maturity allowance for credit loss (125,000)   (125,000)   (54,000)
Federal Home Loan Bank Stock 185,000,000   185,000,000   209,000,000
Federal Reserve Bank Stock 87,000,000   87,000,000   87,000,000
Equity securities with readily determinable fair values, Fair Value 7,000,000   7,000,000   6,000,000
Equity Securities without Readily Determinable Fair Value, Amount 24,231,000   24,231,000   19,225,000
Held-to-maturity Securities [Member]          
Investment Securities Information [Line Items]          
Interest receivable 18,000,000   18,000,000   19,000,000
Available-for-sale Securities [Member]          
Investment Securities Information [Line Items]          
Interest receivable 13,000,000   13,000,000   9,000,000
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]          
Investment Securities Information [Line Items]          
Interest receivable 3,000,000   3,000,000   3,000,000
Federal Reserve Bank Stock [Member]          
Investment Securities Information [Line Items]          
Interest receivable 0   0   0
US Treasury Securities          
Investment Securities Information [Line Items]          
Held to maturity allowance for credit loss 0   0   0
US States and Political Subdivisions Debt Securities [Member]          
Investment Securities Information [Line Items]          
Held to maturity allowance for credit loss 0   0   0
Agency mortgage-related securities          
Investment Securities Information [Line Items]          
Held to maturity allowance for credit loss $ 0   $ 0   $ 0