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Investment securities (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019 and December 31, 2018 are shown below: 
 
 
December 31, 2019
 
 
 
Amortized cost

 
Gross unrealized gains

 
Gross unrealized losses

 
Fair Value

Investment Securities
 
 
 
 
 
 
 
 
Available-for-sale debt securities
 
 
 
 
 
 
 
 
Mortgage-backed securities - residential
 
$
487,101

 
$
5,236

 
$
(1,661
)
 
$
490,676

Municipals, tax exempt
 
181,178

 
8,287

 
(230
)
 
189,235

Treasury securities
 
7,426

 
22

 
—

 
7,448

Corporate securities
 
1,000

 
22

 
—

 
1,022

Total
 
$
676,705

 
$
13,567

 
$
(1,891
)
 
$
688,381

 
 
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
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.
 
 
2019
 
 
2018
 
 
 
Available-for-sale
 
 
Available-for-sale
 
 
 
Amortized cost

 
Fair value

 
Amortized cost

 
Fair value

Due in one year or less
 
$
1,148

 
$
1,152

 
$
15,883

 
$
16,028

Due in one to five years
 
11,553

 
11,676

 
13,806

 
13,740

Due in five to ten years
 
18,287

 
18,887

 
18,539

 
18,387

Due in over ten years
 
158,616

 
165,990

 
99,151

 
98,963

 
 
189,604

 
197,705

 
147,379

 
147,118

Mortgage-backed securities - residential
 
487,101

 
490,676

 
520,654

 
508,580

Total debt securities
 
$
676,705

 
$
688,381

 
$
668,033

 
$
655,698
Summary of Summary of Sales and Other Dispositions of Available-for-Sale Securities
Sales and other dispositions of available-for-sale securities were as follows:
 
Year Months Ended December 31,
 
 
2019

 
2018

 
2017
Proceeds from sales
$
24,498

 
$
2,742

 
$
94,743

Proceeds from maturities, prepayments and calls
113,018

 
73,066

 
83,344

Gross realized gains
7

 
9

 
1,278

Gross realized losses
98

 
44

 
48
Schedule of Gross Unrealized Losses
The following tables show gross unrealized losses at December 31, 2019 and December 31, 2018, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:
 
 
 
December 31, 2019
 
 
 
Less than 12 months
 
 
12 months or more
 
 
Total
 
 
 
Fair Value

 
Unrealized Loss

 
Fair Value

 
Unrealized Loss

 
Fair Value

 
Unrealized loss

Mortgage-backed securities - residential
 
$
47,641

 
$
(164
)
 
$
175,730

 
$
(1,497
)
 
$
223,371

 
$
(1,661
)
Municipals, tax exempt
 
15,433

 
(230
)
 
—

 
—

 
15,433

 
(230
)
Total
 
$
63,074

 
$
(394
)
 
$
175,730

 
$
(1,497
)
 
$
238,804

 
$
(1,891
)
 
 
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
 
$
87,858

 
$
(844
)
 
$
369,343

 
$
(14,247
)
 
$
457,201

 
$
(15,091
)