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Securities (Tables)
 3 Months Ended
Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale Securities
 
December 31, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(In thousands)
Securities Available for Sale:
 
 
 
 
 
 
 
Marketable equity securities
$
9,437

 
$
755

 
$
(472
)
 
$
9,720

 
 
 
 
 
 
 
 
The amortized cost and estimated fair value of securities available for sale and securities held to maturity, with gross unrealized gains and losses, follows:
 
March 31, 2018
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(In thousands)
 
 
 
 
 
 
 
 
Securities Held to Maturity:
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
Government-sponsored enterprises
$
30,678

 
$
—

 
$
(1,187
)
 
$
29,491

Government-sponsored mortgage-backed and collateralized mortgage obligations
245,585

 
15

 
(6,892
)
 
238,708

SBA asset-backed securities
27,773

 
—

 
(500
)
 
27,273

Total securities held to maturity
$
304,036

 
$
15

 
$
(8,579
)
 
$
295,472
Held-to-maturity Securities
The amortized cost and estimated fair value of securities available for sale and securities held to maturity, with gross unrealized gains and losses, follows:
 
March 31, 2018
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
 
(In thousands)
 
 
 
 
 
 
 
 
Securities Held to Maturity:
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
Government-sponsored enterprises
$
30,678

 
$
—

 
$
(1,187
)
 
$
29,491

Government-sponsored mortgage-backed and collateralized mortgage obligations
245,585

 
15

 
(6,892
)
 
238,708

SBA asset-backed securities
27,773

 
—

 
(500
)
 
27,273

Total securities held to maturity
$
304,036

 
$
15

 
$
(8,579
)
 
$
295,472

Securities Held to Maturity:
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
Government-sponsored enterprises
$
30,673

 
$
—

 
$
(894
)
 
$
29,779

Government-sponsored mortgage-backed and collateralized mortgage obligations
244,668

 
30

 
(3,437
)
 
241,261

SBA asset-backed securities
28,375

 
28

 
(329
)
 
28,074

Total securities held to maturity
$
303,716

 
$
58

 
$
(4,660
)
 
$
299,114
Investments Classified by Contractual Maturity Date
The amortized cost and estimated fair value of debt securities by contractual maturity at March 31, 2018 are included in the following table. Expected maturities will differ from contractual maturities because the issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Based on expected maturities, the mortgage and asset-backed securities and collateralized mortgage obligations, included below, have a 4.1 year weighted average duration.
 
Amortized Cost
 
Fair Value
 
(In thousands)
After 1 year through 5 years
$
15,630

 
$
15,225

After 5 years through 10 years
15,048

 
14,266

 
30,678

 
29,491

Mortgage and asset-backed securities and collateralized mortgage obligations
273,358

 
265,981

 
$
304,036

 
$
295,472
Unrealized Gain (Loss) and Fair Value of Investments - Available-for-sale Securities
Information pertaining to securities with gross unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous loss position, follows:
 
March 31, 2018
 
Less Than Twelve Months
 
More Than Twelve Months
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
(In thousands)
 
 
 
 
 
 
 
 
Securities Held to Maturity:
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
Government-sponsored enterprises
$
(206
)
 
$
8,429

 
$
(981
)
 
$
21,062

Government-sponsored mortgage-backed and collateralized mortgage obligations
(3,208
)
 
121,191

 
(3,684
)
 
112,427

SBA asset-backed securities
(142
)
 
16,286

 
(358
)
 
10,987

Total temporarily impaired held-to-maturity securities
$
(3,556
)
 
$
145,906

 
$
(5,023
)
 
$
144,476

 
December 31, 2017
 
Less Than Twelve Months
 
More Than Twelve Months
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
(In thousands)
Securities Available for Sale:
 
 
 
 
 
 
 
Temporarily impaired marketable equity securities
$
(449
)
 
$
4,310

 
$
(23
)
 
$
443
Unrealized Gain (Loss) and Fair Value of Investments - Held-to-maturity Securities
 
December 31, 2017
 
Less Than Twelve Months
 
More Than Twelve Months
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
(In thousands)
Securities Held to Maturity:
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
Government-sponsored enterprises
$
(109
)
 
$
8,521

 
$
(785
)
 
$
21,258

Government-sponsored mortgage-backed and collateralized mortgage obligations
(1,563
)
 
119,782

 
(1,874
)
 
111,712

SBA asset-backed securities
(34
)
 
9,897

 
(295
)
 
11,423

Total temporarily impaired securities held to maturity
$
(1,706
)
 
$
138,200

 
$
(2,954
)
 
$
144,393

Information pertaining to securities with gross unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous loss position, follows:
 
March 31, 2018
 
Less Than Twelve Months
 
More Than Twelve Months
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
(In thousands)
 
 
 
 
 
 
 
 
Securities Held to Maturity:
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
Government-sponsored enterprises
$
(206
)
 
$
8,429

 
$
(981
)
 
$
21,062

Government-sponsored mortgage-backed and collateralized mortgage obligations
(3,208
)
 
121,191

 
(3,684
)
 
112,427

SBA asset-backed securities
(142
)
 
16,286

 
(358
)
 
10,987

Total temporarily impaired held-to-maturity securities
$
(3,556
)
 
$
145,906

 
$
(5,023
)
 
$
144,476