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Investment Securities Available-for-Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized cost | $ 740,187 | $ 793,634
Gross unrealized gains | 7,699 | 2,321
Gross unrealized losses | 2,543 | 11,816
Estimated fair value | 745,343 | 784,139
US Agency Securities [Member] |  |
Amortized cost | 225,389 | 260,150
Gross unrealized gains | 940 | 228
Gross unrealized losses | 659 | 4,033
Estimated fair value | 225,670 | 256,345
Residential Mortgage Backed Securities [Member] |  |
Amortized cost | 440,243 | 477,949
Gross unrealized gains | 5,186 | 1,575
Gross unrealized losses | 1,884 | 7,293
Estimated fair value | 443,545 | 472,231
Municipal Bonds [Member] |  |
Amortized cost | 67,835 | 45,814
Gross unrealized gains | 1,503 | 439
Gross unrealized losses |  | 484
Estimated fair value | 69,338 | 45,769
Corporate Bonds [Member] |  |
Amortized cost | 6,502 | 9,503
Gross unrealized gains | 70 | 79
Gross unrealized losses |  | 6
Estimated fair value | 6,572 | 9,576
Investment Securities [Member] |  |
Amortized cost | 218 |
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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X
- 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=118939692&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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