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Investment Securities Available-for-Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized cost | $ 774,487 | $ 793,634
Gross unrealized gains | 4,212 | 2,321
Gross unrealized losses | 6,470 | 11,816
Estimated fair value | 772,229 | 784,139
US Agency Securities [Member] |  |
Amortized cost | 240,675 | 260,150
Gross unrealized gains | 435 | 228
Gross unrealized losses | 2,091 | 4,033
Estimated fair value | 239,019 | 256,345
Residential Mortgage Backed Securities [Member] |  |
Amortized cost | 479,162 | 477,949
Gross unrealized gains | 3,027 | 1,575
Gross unrealized losses | 4,286 | 7,293
Estimated fair value | 477,903 | 472,231
Municipal Bonds [Member] |  |
Amortized cost | 44,929 | 45,814
Gross unrealized gains | 684 | 439
Gross unrealized losses | 80 | 484
Estimated fair value | 45,533 | 45,769
Corporate Bonds [Member] |  |
Amortized cost | 9,503 | 9,503
Gross unrealized gains | 66 | 79
Gross unrealized losses | 13 | 6
Estimated fair value | 9,556 | 9,576
Investment Securities [Member] |  |
Amortized cost | 218 | 218
Gross unrealized gains |  |
Gross unrealized losses |  |
Estimated fair value | $ 218 | $ 218

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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Balance Type: | debit
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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