Investment Securities (Summary of Available-for-sale and Held-to-maturity Securities) (Details) - USD ($)
|
Mar. 31, 2020 |
Dec. 31, 2019 |
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Amortized Cost |
$ 739,900,000
|
$ 496,165,000
|
| Gross Unrealized Gains |
21,951,000
|
4,598,000
|
| Gross Unrealized Losses |
312,000
|
1,768,000
|
| Estimated Fair Value |
761,539,000
|
498,995,000
|
| Investment securities held-to-maturity |
|
|
| Amortized Cost |
0
|
86,780,000
|
| Gross Unrealized Gains |
|
935,000
|
| Gross Unrealized Losses |
|
154,000
|
| Estimated Fair Value |
0
|
87,561,000
|
| Equity securities held-for-trading |
|
|
| Estimated Fair Value |
2,558,000
|
3,581,000
|
| GSE debentures |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Amortized Cost |
231,779,000
|
182,922,000
|
| Gross Unrealized Gains |
6,176,000
|
2,939,000
|
| Gross Unrealized Losses |
138,000
|
58,000
|
| Estimated Fair Value |
237,817,000
|
185,803,000
|
| Investment securities held-to-maturity |
|
|
| Amortized Cost |
|
31,228,000
|
| Gross Unrealized Gains |
|
113,000
|
| Gross Unrealized Losses |
|
51,000
|
| Estimated Fair Value |
|
31,290,000
|
| GSE CMOs |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Amortized Cost |
62,391,000
|
87,001,000
|
| Gross Unrealized Gains |
1,151,000
|
22,000
|
| Gross Unrealized Losses |
15,000
|
1,091,000
|
| Estimated Fair Value |
63,527,000
|
85,932,000
|
| GSE MBSs |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Amortized Cost |
319,088,000
|
153,049,000
|
| Gross Unrealized Gains |
9,551,000
|
797,000
|
| Gross Unrealized Losses |
141,000
|
503,000
|
| Estimated Fair Value |
328,498,000
|
153,343,000
|
| Investment securities held-to-maturity |
|
|
| Amortized Cost |
|
9,360,000
|
| Gross Unrealized Gains |
|
0
|
| Gross Unrealized Losses |
|
81,000
|
| Estimated Fair Value |
|
9,279,000
|
| SBA commercial loan asset-backed securities |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Amortized Cost |
1,000
|
34,000
|
| Gross Unrealized Gains |
0
|
0
|
| Gross Unrealized Losses |
0
|
0
|
| Estimated Fair Value |
1,000
|
34,000.0
|
| Corporate debt obligations |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Amortized Cost |
25,389,000
|
28,484,000
|
| Gross Unrealized Gains |
570,000
|
502,000
|
| Gross Unrealized Losses |
0
|
0
|
| Estimated Fair Value |
25,959,000
|
28,986,000
|
| U.S. Treasury bonds |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Amortized Cost |
55,776,000
|
44,675,000
|
| Gross Unrealized Gains |
3,858,000
|
338,000
|
| Gross Unrealized Losses |
0
|
116,000
|
| Estimated Fair Value |
59,634,000
|
44,897,000
|
| Municipal obligations |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Amortized Cost |
44,976,000
|
|
| Gross Unrealized Gains |
645,000
|
|
| Gross Unrealized Losses |
3,000
|
|
| Estimated Fair Value |
45,618,000
|
|
| Investment securities held-to-maturity |
|
|
| Amortized Cost |
|
45,692,000
|
| Gross Unrealized Gains |
|
822,000
|
| Gross Unrealized Losses |
|
0
|
| Estimated Fair Value |
|
46,514,000
|
| Foreign government obligations |
|
|
| Debt Securities, Available-for-sale [Line Items] |
|
|
| Amortized Cost |
500,000
|
|
| Gross Unrealized Gains |
0
|
|
| Gross Unrealized Losses |
15,000
|
|
| Estimated Fair Value |
$ 485,000
|
|
| Investment securities held-to-maturity |
|
|
| Amortized Cost |
|
500,000
|
| Gross Unrealized Gains |
|
0
|
| Gross Unrealized Losses |
|
22,000
|
| Estimated Fair Value |
|
$ 478,000
|