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Investment Securities (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]      
Money market investments $ 8,952 $ 11,908 $ 6,775
Pledged assets 145,600 148,800  
Restricted cash 175 1,375 1,450
Securitized GNMA pools retained, amortized cost $ 149,100 $ 90,100 $ 62,800
Securitized GNMA pool retained, yield 2.45% 2.48% 3.23%
Available for sale securities in continuous loss position for 12 months or more $ 0 $ 0  
Held to maturity securities in continuous loss position for 12 months or more 0    
Mortgage Backed Securities      
Debt Securities, Available-for-sale [Line Items]      
Proceeds from sale of available for sale securities 2,200 316,300 $ 672,200
Gain on sales of mortgaged-backed securities 19 4,700 $ 8,300
OIB      
Debt Securities, Available-for-sale [Line Items]      
Restricted cash 305 305  
Oriental Overseas      
Debt Securities, Available-for-sale [Line Items]      
Restricted cash 325 325  
Public Funds      
Debt Securities, Available-for-sale [Line Items]      
Pledged assets $ 143,800 $ 146,400