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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

X

- 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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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

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=82897076&loc=d3e27161-111563

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X

- 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.

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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.

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