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SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of Securities
The amortized cost, gross unrealized gains and losses and estimated fair value of securities at December 31, 2018 and 2017 are summarized as follows (in thousands):
 
December 31, 2018
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Trading:
 
 
 
 
 
 
 
Corporate bonds
$
27,203

 
 
 
 
 
$
25,896

 
 
 
 
 
 
 
 
Available-for-Sale:
 
 
 
 
 
 
 
U.S. Government and agency obligations
$
151,012

 
$
149

 
$
(2,049
)
 
$
149,112

Municipal bonds
116,548

 
1,806

 
(532
)
 
117,822

Corporate bonds
3,556

 
—

 
(61
)
 
3,495

Mortgage-backed or related securities
1,355,258

 
5,210

 
(16,607
)
 
1,343,861

Asset-backed securities
22,047

 
6

 
(120
)
 
21,933

 
$
1,648,421

 
$
7,171

 
$
(19,369
)
 
$
1,636,223

Held-to-Maturity:
 
 
 
 
 
 
 
U.S. Government and agency obligations
$
1,006

 
$
14

 
$
(1
)
 
$
1,019

Municipal bonds:
176,663

 
1,727

 
(2,578
)
 
175,812

Corporate bonds
3,736

 
—

 
(13
)
 
3,723

Mortgage-backed or related securities
52,815

 
66

 
(898
)
 
51,983

 
$
234,220

 
$
1,807

 
$
(3,490
)
 
$
232,537

 
December 31, 2017
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Trading:
 
 
 
 
 
 
 
Municipal bonds
$
100

 
 
 
 
 
$
100

Corporate bonds
27,132

 
 
 
 
 
22,058

Equity securities
14

 
 
 
 
 
160

 
$
27,246

 
 
 
 
 
$
22,318

Available-for-Sale:
 
 
 
 
 
 
 
U.S. Government and agency obligations
$
72,829

 
$
68

 
$
(431
)
 
$
72,466

Municipal bonds
68,513

 
665

 
(445
)
 
68,733

Corporate bonds
5,431

 
6

 
(44
)
 
5,393

Mortgage-backed or related securities
745,956

 
1,003

 
(7,402
)
 
739,557

Asset-backed securities
27,667

 
184

 
(93
)
 
27,758

Equity securities
5,716

 
10

 
(148
)
 
5,578

 
$
926,112

 
$
1,936

 
$
(8,563
)
 
$
919,485

Held-to-Maturity:
 
 
 
 
 
 
 
U.S. Government and agency obligations
$
1,024

 
$
29

 
$
—

 
$
1,053

Municipal bonds:
189,860

 
3,385

 
(1,252
)
 
191,993

Corporate bonds
3,978

 
7

 
—

 
3,985

Mortgage-backed or related securities
65,409

 
266

 
(518
)
 
65,157

 
$
260,271

 
$
3,687

 
$
(1,770
)
 
$
262,188
Schedule of Securities with Continuous Loss Position
At December 31, 2018 and 2017, the gross unrealized losses and the fair value for securities available-for-sale and held-to-maturity aggregated by the length of time that individual securities have been in a continuous unrealized loss position was as follows (in thousands):
 
December 31, 2018
 
Less Than 12 Months
 
12 Months or More
 
Total
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
Available-for-Sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. Government and agency obligations
$
75,885

 
$
(1,240
)
 
$
50,508

 
$
(809
)
 
$
126,393

 
$
(2,049
)
Municipal bonds
6,422

 
(54
)
 
27,231

 
(478
)
 
33,653

 
(532
)
Corporate bonds
3,199

 
(56
)
 
295

 
(5
)
 
3,494

 
(61
)
Mortgage-backed or related securities
316,074

 
(2,939
)
 
571,989

 
(13,668
)
 
888,063

 
(16,607
)
Asset-backed securities
10,582

 
(24
)
 
9,913

 
(96
)
 
20,495

 
(120
)
 
$
412,162

 
$
(4,313
)
 
$
659,936

 
$
(15,056
)
 
$
1,072,098

 
$
(19,369
)
Held-to-Maturity:
 
 
 
 
 
 
 
 
 
 
 
U.S. Government and agency obligations
$
145

 
$
(1
)
 
$
—

 
$
—

 
$
145

 
$
(1
)
Municipal bonds
29,898

 
(274
)
 
44,637

 
(2,304
)
 
74,535

 
(2,578
)
Corporate bonds
—

 
—

 
487

 
(13
)
 
487

 
(13
)
Mortgage-backed or related securities
10,761

 
(220
)
 
30,035

 
(678
)
 
40,796

 
(898
)
 
$
40,804

 
$
(495
)
 
$
75,159

 
$
(2,995
)
 
$
115,963

 
$
(3,490
)
 
 
December 31, 2017
 
Less Than 12 Months
 
12 Months or More
 
Total
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
Available-for-Sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. Government and agency obligations
$
31,276

 
$
(211
)
 
$
23,341

 
$
(220
)
 
$
54,617

 
$
(431
)
Municipal bonds
20,879

 
(185
)
 
13,360

 
(260
)
 
34,239

 
(445
)
Corporate bonds
296

 
(4
)
 
4,682

 
(40
)
 
4,978

 
(44
)
Mortgage-backed or related securities
559,916

 
(5,138
)
 
100,662

 
(2,264
)
 
660,578

 
(7,402
)
Asset-backed securities
—

 
—

 
9,926

 
(93
)
 
9,926

 
(93
)
Equity securities
5,480

 
(148
)
 
—

 
—

 
5,480

 
(148
)
 
$
617,847

 
$
(5,686
)
 
$
151,971

 
$
(2,877
)
 
$
769,818

 
$
(8,563
)
Held-to-Maturity:
 
 
 
 
 
 
 
 
 
 
 
Municipal bonds
$
21,839

 
$
(171
)
 
$
34,314

 
$
(1,081
)
 
$
56,153

 
$
(1,252
)
Mortgage-backed or related securities
38,023

 
(378
)
 
4,434

 
(140
)
 
42,457

 
(518
)
 
$
59,862

 
$
(549
)
 
$
38,748

 
$
(1,221
)
 
$
98,610

 
$
(1,770
)
Schedule of Securities by Contractual Maturity Date
The amortized cost and estimated fair value of securities at December 31, 2018, by contractual maturity, are shown below (in thousands).  Expected maturities will differ from contractual maturities because some securities may be called or prepaid with or without call or prepayment penalties.
 
December 31, 2018
 
Trading
 
Available-for-Sale
 
Held-to-Maturity
 
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
Maturing in one year or less
$
—

 
$
—

 
$
10,680

 
$
10,661

 
$
2,885

 
$
2,875

Maturing after one year through five years
—

 
—

 
84,333

 
84,140

 
60,124

 
59,591

Maturing after five years through ten years
—

 
—

 
383,987

 
381,628

 
62,942

 
63,352

Maturing after ten years through twenty years
27,203

 
25,896

 
210,917

 
210,883

 
70,968

 
71,378

Maturing after twenty years
—

 
—

 
958,504

 
948,911

 
37,301

 
35,341

 
$
27,203

 
$
25,896

 
$
1,648,421

 
$
1,636,223

 
$
234,220

 
$
232,537
Schedule of Pledged Securities
The following table presents, as of December 31, 2018, investment securities which were pledged to secure borrowings, public deposits or other obligations as permitted or required by law (in thousands):
 
Carrying Value
 
Amortized Cost
 
Fair Value
Purpose or beneficiary:
 
 
 
 
 
State and local governments public deposits
$
143,336

 
$
143,505

 
$
143,887

Interest rate swap counterparties
11,356

 
11,576

 
11,344

Repurchase transaction accounts
154,042

 
155,014

 
154,042

Other
3,827

 
3,827

 
3,719

Total pledged securities
$
312,561

 
$
313,922

 
$
312,992