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Note 7 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Investment securities available for sale, amortized cost	$ 1,122,994	$ 1,443,730
Investment securities available for sale, gross unrealized gains	24,313	9,852
Investment securities available for sale, gross unrealized losses	1,205	1,740
Investment securities available for sale, Estimated fair value	1,146,102	1,451,842
US Treasury Securities [Member]
Investment securities available for sale, amortized cost	99,935	74,926
Investment securities available for sale, gross unrealized gains	1	10
Investment securities available for sale, gross unrealized losses	9	0
Investment securities available for sale, Estimated fair value	99,927	74,936
US Government Corporations and Agencies Securities [Member]
Investment securities available for sale, amortized cost	107,558	90,452
Investment securities available for sale, gross unrealized gains	499	663
Investment securities available for sale, gross unrealized losses	664	319
Investment securities available for sale, Estimated fair value	107,393	90,796
Collateralized Mortgage Backed Securities [Member]
Investment securities available for sale, amortized cost	779,492	880,040
Investment securities available for sale, gross unrealized gains	23,428	8,574
Investment securities available for sale, gross unrealized losses	508	824
Investment securities available for sale, Estimated fair value	802,412	887,790
US Government-sponsored Enterprises Debt Securities [Member]
Investment securities available for sale, amortized cost		225,000
Investment securities available for sale, gross unrealized gains		0
Investment securities available for sale, gross unrealized losses		557
Investment securities available for sale, Estimated fair value		224,443
Collateralized Mortgage Obligations [Member]
Investment securities available for sale, amortized cost	314	569
Investment securities available for sale, gross unrealized gains	0	0
Investment securities available for sale, gross unrealized losses	13	17
Investment securities available for sale, Estimated fair value	301	552
Corporate Debt Securities [Member]
Investment securities available for sale, amortized cost	135,695	172,743
Investment securities available for sale, gross unrealized gains	385	605
Investment securities available for sale, gross unrealized losses	11	23
Investment securities available for sale, Estimated fair value	$ 136,069	$ 173,325

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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