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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of Changes in AOCI
Changes in other comprehensive income are summarized as follows for the years ended December 31, 2018, 2017 and 2016 (in thousands):
 
2018
 
Before Tax
 
Tax Effect
 
Net of Tax
Unrealized gains on investment securities available for sale:
 

 
 

 
 

Net unrealized holding loss arising during the period
$
(77,607
)
 
$
20,566

 
$
(57,041
)
Amounts reclassified to gain on investment securities available for sale, net
(6,103
)
 
1,617

 
(4,486
)
Net change in unrealized gains on investment securities available for sale
(83,710
)
 
22,183

 
(61,527
)
Unrealized losses on derivative instruments:
 
 
 
 
 
Net unrealized holding gain arising during the period
5,416

 
(1,435
)
 
3,981

Amounts reclassified to interest expense on borrowings
(1,999
)
 
530

 
(1,469
)
Net change in unrealized losses on derivative instruments
3,417

 
(905
)
 
2,512

Other comprehensive loss
$
(80,293
)
 
$
21,278

 
$
(59,015
)

 
2017
 
Before Tax
 
Tax Effect
 
Net of Tax
Unrealized gains on investment securities available for sale:
 
 
 
 
 
Net unrealized holding gain arising during the period
$
49,131

 
$
(19,407
)
 
$
29,724

Amounts reclassified to gain on investment securities available for sale, net
(33,466
)
 
13,219

 
(20,247
)
Net change in unrealized gains on investment securities available for sale
15,665

 
(6,188
)
 
9,477

Unrealized losses on derivative instruments:
 
 
 
 
 
Net unrealized holding loss arising during the period
(2,577
)
 
1,018

 
(1,559
)
Amounts reclassified to interest expense on borrowings
9,621

 
(3,800
)
 
5,821

Net change in unrealized losses on derivative instruments
7,044

 
(2,782
)
 
4,262

Other comprehensive income
$
22,709

 
$
(8,970
)
 
$
13,739

 
2016
 
Before Tax
 
Tax Effect
 
Net of Tax
Unrealized gains on investment securities available for sale:
 

 
 

 
 

Net unrealized holding gain arising during the period
$
23,588

 
$
(9,317
)
 
$
14,271

Amounts reclassified to gain on investment securities available for sale, net
(14,461
)
 
5,712

 
(8,749
)
Net change in unrealized gains on investment securities available for sale
9,127

 
(3,605
)
 
5,522

Unrealized losses on derivative instruments:
 
 
 
 
 
Net unrealized holding gain arising during the period
6,225

 
(2,459
)
 
3,766

Amounts reclassified to interest expense on borrowings
16,161

 
(6,384
)
 
9,777

Net change in unrealized losses on derivative instruments
22,386

 
(8,843
)
 
13,543

Other comprehensive income
$
31,513

 
$
(12,448
)
 
$
19,065
Schedule of the Categories of AOCI and Changes Therein
The categories of AOCI and changes therein are presented below for the years ended December 31, 2018, 2017 and 2016 (in thousands):
 
Unrealized Gain (Loss) on
Investment Securities
Available for Sale
 
Unrealized Gain (Loss)
on Derivative
Instruments
 
Total
Balance at December 31, 2015
$
41,535

 
$
(19,353
)
 
$
22,182

Other comprehensive income
5,522

 
13,543

 
19,065

Balance at December 31, 2016
$
47,057

 
$
(5,810
)
 
$
41,247

Other comprehensive income
9,477

 
4,262

 
13,739

Balance at December 31, 2017
$
56,534

 
$
(1,548
)
 
$
54,986

Cumulative effect of adoption of new accounting standards
9,187

 
(285
)
 
8,902

Other comprehensive loss
(61,527
)
 
2,512

 
(59,015
)
Balance at December 31, 2018
$
4,194

 
$
679

 
$
4,873