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Investment securities (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Cost of Securities and Fair Values
The amortized cost of securities and their fair values at December 31, 2018 and 2017 are shown below: 
 
 
December 31, 2018
 
 
 
Amortized cost

 
Gross unrealized gains

 
Gross unrealized losses

 
Fair Value

Investment Securities
 
 
 
 
 
 
 
 
Available-for-sale debt securities
 
 
 
 
 
 
 
 
U.S. government agency securities
 
$
1,000

 
$
—

 
$
(11
)
 
$
989

Mortgage-backed securities - residential
 
520,654

 
1,191

 
(13,265
)
 
508,580

Municipals, tax exempt
 
138,994

 
1,565

 
(1,672
)
 
138,887

Treasury securities
 
7,385

 
—

 
(143
)
 
7,242

Total
 
$
668,033

 
$
2,756

 
$
(15,091
)
 
$
655,698

As of December 31, 2018, the Company also had $3,107 in marketable equity securities recorded at fair value. Net losses of $81 were recognized due to changes in fair value of these securities during the year ended December 31, 2018. As of January 1, 2018, the Company adopted ASU 2016-01 (See Note 1) and reclassified $3,604 of other securities without readily determinable market values to other assets.
 
 
December 31, 2017
 
 
 
Amortized cost

 
Gross unrealized gains

 
Gross unrealized losses

 
Fair Value

Investment Securities
 
 
 
 
 
 
 
 
Available-for-sale debt securities
 
 
 
 
 
 
 
 
U.S. government agency securities
 
$
999

 
$
—

 
$
(13
)
 
$
986

Mortgage-backed securities - residential
 
425,557

 
374

 
(7,150
)
 
418,781

Municipals, tax exempt
 
107,127

 
2,692

 
(568
)
 
109,251

Treasury securities
 
7,345

 
—

 
(93
)
 
7,252

Total debt securities
 
541,028

 
3,066

 
(7,824
)
 
536,270

Equity securities
 
7,870

 
1

 
(149
)
 
7,722

Total securities available-for-sale
 
$
548,898

 
$
3,067

 
$
(7,973
)
 
$
543,992
Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity
Therefore, mortgage-backed securities are not included in the maturity categories in the following maturity summary.
 
 
Year Ended December 31,
 
 
 
2018
 
 
2017
 
 
 
Available-for-sale
 
 
Available-for-sale
 
 
 
Amortized cost

 
Fair value

 
Amortized cost

 
Fair value

Due in one year or less
 
$
15,883

 
$
16,028

 
$
905

 
$
925

Due in one to five years
 
13,806

 
13,740

 
28,332

 
28,878

Due in five to ten years
 
18,539

 
18,387

 
19,218

 
19,588

Due in over ten years
 
99,151

 
98,963

 
67,016

 
68,098

 
 
147,379

 
147,118

 
115,471

 
117,489

Mortgage-backed securities - residential
 
520,654

 
508,580

 
425,557

 
418,781

Total debt securities
 
$
668,033

 
$
655,698

 
$
541,028

 
$
536,270
Summary of Sales of Available-for-Sale Securities
Sales of available-for-sale securities were as follows:
 
 
Year Ended December 31,
 
 
 
2018

 
2017

 
2016

Proceeds from sales
 
$
2,742

 
$
94,743

 
$
271,148

Gross realized gains
 
8

 
1,277

 
4,755

Gross realized losses
 
44

 
48

 
348
Schedule of Gross Unrealized Losses
The Company also recognized $1 and $1 on gains related to the early call of available for sale securities during the years ended December 31, 2018 and December 31, 2017, respectively.
The following tables show gross unrealized losses at December 31, 2018 and 2017, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:
 
 
 
December 31, 2018
 
 
 
Less than 12 months
 
 
12 months or more
 
 
Total
 
 
 
Fair Value

 
Unrealized Loss

 
Fair Value

 
Unrealized Loss

 
Fair Value

 
Unrealized loss

U.S. government agency securities
 
$
—

 
$
—

 
$
989

 
$
(11
)
 
$
989

 
$
(11
)
Mortgage-backed securities - residential
 
60,347

 
(478
)
 
335,769

 
(12,787
)
 
396,116

 
(13,265
)
Municipals, tax exempt
 
27,511

 
(366
)
 
25,343

 
(1,306
)
 
52,854

 
(1,672
)
Treasury securities
 
—

 
—

 
7,242

 
(143
)
 
7,242

 
(143
)
Total debt securities
 
$
87,858

 
$
(844
)
 
$
369,343

 
$
(14,247
)
 
$
457,201

 
$
(15,091
)
 
 
December 31, 2017
 
 
 
Less than 12 months
 
 
12 months or more
 
 
Total
 
 
 
Fair Value

 
Unrealized Loss

 
Fair Value

 
Unrealized Loss

 
Fair Value

 
Unrealized loss

U.S. government agency securities
 
$
—

 
$
—

 
$
986

 
$
(13
)
 
$
986

 
$
(13
)
Mortgage-backed securities - residential
 
107,611

 
(980
)
 
290,258

 
(6,170
)
 
397,869

 
(7,150
)
Municipals, tax exempt
 
7,354

 
(101
)
 
20,112

 
(467
)
 
27,466

 
(568
)
Treasury securities
 
7,252

 
(93
)
 
—

 
—

 
7,252

 
(93
)
Total debt securities
 
122,217

 
(1,174
)
 
311,356

 
(6,650
)
 
433,573

 
(7,824
)
Equity securities
 
—

 
—

 
3,050

 
(149
)
 
3,050

 
(149
)
 
 
$
122,217

 
$
(1,174
)
 
$
314,406

 
$
(6,799
)
 
$
436,623

 
$
(7,973
)