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Investment Securities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Money market investments	$ 9,837	$ 14,617	$ 9,837	$ 14,617	$ 11,908
Securitized GNMA pools retained, amortized cost	$ 117,100	$ 46,200	$ 117,100	$ 46,200
Securitized GNMA pool retained, yield	2.51%	2.69%	2.51%	2.69%
Gain on sales of mortgaged-backed securities				$ 4,700
Proceeds from sale of available for sale securities			$ 0	320,984
Recognized gain on sale of available-for-sale securities	$ 0	$ 0	0	4,728
Restricted cash	179	$ 1,050	179	1,050	1,375
Carrying value of securities sold				$ 316,256
OIB [Member]
Schedule of Available-for-sale Securities [Line Items]
Restricted cash	305		305		305
Oriental Overseas [Member]
Schedule of Available-for-sale Securities [Line Items]
Restricted cash	$ 325		$ 325		$ 325

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Net gain (loss) resulting from the sales of securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages).

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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