Securities (Tables)
12 Months Ended
Dec. 31, 2021
Securities  
Schedule of amortized cost and fair value of the securities portfolio and corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive loss

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​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Gross

​

Gross

​

​

​

​

​

Amortized

​

Unrealized

​

Unrealized

​

Fair

December 31, 2021

    

Cost1

    

Gains

    

Losses

​

Value

Securities available-for-sale

​

​

​

​

​

​

​

​

​

U.S. Treasury

​

$

202,251

​

$

125

​

$

(37)

​

$

202,339

U.S. government agencies

​

​

62,587

​

​

-

​

​

(699)

​

​

61,888

U.S. government agencies mortgage-backed

​

​

172,016

​

​

856

​

​

(570)

​

​

172,302

States and political subdivisions

​

​

240,793

​

​

16,344

​

​

(672)

​

​

256,465

Corporate bonds

​

​

10,000

​

​

-

​

​

(113)

​

​

9,887

Collateralized mortgage obligations

​

​

673,238

​

​

2,014

​

​

(2,285)

​

​

672,967

Asset-backed securities

​

​

236,293

​

​

1,245

​

​

(661)

​

​

236,877

Collateralized loan obligations

​

​

79,838

​

​

3

​

​

(78)

​

​

79,763

Total securities available-for-sale

​

$

1,677,016

​

$

20,587

​

$

(5,115)

​

$

1,692,488

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​

​

​

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​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Gross

​

Gross

​

​

​

​

​

Amortized

​

Unrealized

​

Unrealized

​

Fair

December 31, 2020

    

Cost1

    

Gains

    

Losses

​

Value

Securities available-for-sale

​

​

​

​

​

​

​

​

​

​

​

​

U.S. Treasury

​

$

4,014

​

$

103

​

$

-

​

$

4,117

U.S. government agencies

​

​

6,811

​

​

-

​

​

(154)

​

​

6,657

U.S. government agencies mortgage-backed

​

​

16,098

​

​

1,112

​

​

(1)

​

​

17,209

States and political subdivisions

​

​

229,352

​

​

21,269

​

​

(1,362)

​

​

249,259

Collateralized mortgage obligations

​

​

53,999

​

​

2,866

​

​

(280)

​

​

56,585

Asset-backed securities

​

​

130,959

​

​

1,370

​

​

(511)

​

​

131,818

Collateralized loan obligations

​

​

30,728

​

​

15

​

​

(210)

​

​

30,533

Total securities available-for-sale

​

$

471,961

​

$

26,735

​

$

(2,518)

​

$

496,178

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​

​

​

​

​

​

​

​

​

​

​

​

1 Excludes interest receivable of $4.3 million and $2.7 million at December 31, 2021 and December 31, 2020, respectively, that is recorded in other assets on the consolidated balance sheet.

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Schedule of fair value, amortized cost and weighted average yield of debt securities by contractual maturity along with securities not due at a single maturity date, primarily mortgage-backed securities (MBS), asset-backed securities, and collateralized loan obligations

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Weighted

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​

​

​

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Amortized

​

Average

​

​

Fair

​

Securities available-for-sale

    

Cost

    

Yield

​

    

Value

  

Due in one year or less

​

$

8,671

​

1.24

%

​

$

8,707

​

Due after one year through five years

​

​

274,984

​

0.89

​

​

​

274,537

​

Due after five years through ten years

​

​

43,770

​

2.43

​

​

​

45,470

​

Due after ten years

​

​

188,206

​

2.98

​

​

​

201,865

​

​

​

​

515,631

​

1.79

​

​

​

530,579

​

Mortgage-backed and collateralized mortgage obligations

​

​

845,254

​

1.19

​

​

​

845,269

​

Asset-backed securities

​

​

236,293

​

1.12

​

​

​

236,877

​

Collateralized loan obligations

​

​

79,838

​

1.60

​

​

​

79,763

​

Total securities available-for-sale

​

$

1,677,016

​

1.38

%

​

$

1,692,488

​

Schedule of securities with unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position

Securities with unrealized losses with no corresponding allowance for credit losses at December 31,  aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows (in thousands except for number of securities):

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​

​

​

​

​

​

​

​

​

​

​

​

​

​

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Less than 12 months

​

12 months or more

​

​

​

​

​

​

​

​

December 31, 2021

​

in an unrealized loss position

​

in an unrealized loss position

​

Total

​

​

Number of

​

Unrealized

​

Fair

​

Number of

​

Unrealized

​

Fair

​

Number of

​

Unrealized

​

Fair

Securities available-for-sale

    

Securities

   

Losses

   

Value

   

Securities

   

Losses

   

Value

   

Securities

   

Losses

   

Value

U.S. Treasuries

​

1

​

$

37

​

$

49,719

​

-

​

$

-

​

$

-

​

1

​

$

37

​

$

49,719

U.S. government agencies

​

5

​

$

592

​

$

56,879

​

4

​

$

107

​

$

5,008

​

9

​

$

699

​

$

61,887

U.S. government agencies mortgage-backed

​

63

​

​

505

​

​

78,711

​

1

​

​

65

​

​

1,663

​

64

​

​

570

​

​

80,374

States and political subdivisions

​

7

​

​

55

​

​

8,430

​

1

​

​

617

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​

4,051

​

8

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​

672

​

​

12,481

Corporate bonds

​

2

​

​

113

​

​

9,887

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-

​

​

-

​

​

-

​

2

​

​

113

​

​

9,887

Collateralized mortgage obligations

​

133

​

​

2,285

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​

381,658

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-

​

​

-

​

​

-

​

133

​

​

2,285

​

​

381,658

Asset-backed securities

​

20

​

​

608

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​

103,819

​

3

​

​

53

​

​

3,276

​

23

​

​

661

​

​

107,095

Collateralized loan obligations

​

10

​

​

35

​

​

45,132

​

2

​

​

43

​

​

10,628

​

12

​

​

78

​

​

55,760

Total securities available-for-sale

​

241

​

$

4,230

​

$

734,235

​

11

​

$

885

​

$

24,626

​

252

​

$

5,115

​

$

758,861

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​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Less than 12 months

​

12 months or more

​

​

​

​

​

​

​

​

December 31, 2020

​

in an unrealized loss position

​

in an unrealized loss position

​

Total

​

​

Number of

​

Unrealized

​

​

Fair

​

Number of

​

Unrealized

​

​

Fair

​

Number of

​

Unrealized

​

​

Fair

Securities available-for-sale

    

Securities

   

Losses

   

​

Value

   

Securities

   

Losses

   

​

Value

   

Securities

   

Losses

   

​

Value

U.S. government agencies

​

-

​

$

-

​

$

-

​

4

​

$

154

​

$

6,657

​

4

​

$

154

​

$

6,657

U.S. government agencies mortgage-backed

​

1

​

​

1

​

​

141

​

-

​

​

-

​

​

-

​

1

​

​

1

​

​

141

States and political subdivisions

​

-

​

​

-

​

​

-

​

1

​

​

1,362

​

​

3,433

​

1

​

​

1,362

​

​

3,433

Collateralized mortgage obligations

​

4

​

​

279

​

​

8,142

​

1

​

​

1

​

​

146

​

5

​

​

280

​

​

8,288

Asset-backed securities

​

1

​

​

2

​

​

251

​

3

​

​

509

​

​

49,572

​

4

​

​

511

​

​

49,823

Collateralized loan obligations

​

1

​

​

31

​

​

7,468

​

4

​

​

179

​

​

21,477

​

5

​

​

210

​

​

28,945

Total securities available-for-sale

​

7

​

$

313

​

$

16,002

​

13

​

$

2,205

​

$

81,285

​

20

​

$

2,518

​

$

97,287

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Schedule of proceeds from sale and gross realized gains and losses on sale of securities

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​

​

​

​

​

​

​

​

​

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Year Ended

​

​

​

December 31, 

​

Securities available-for-sale

    

2021

    

2020

 

2019

​

Proceeds from sales of securities

​

$

605,846

​

$

18,006

​

$

191,298

​

Gross realized gains on securities

​

 

270

​

 

17

​

 

5,521

​

Gross realized losses on securities

​

 

(38)

​

 

(42)

​

 

(1,010)

​

Net realized gains (losses)

​

$

232

​

$

(25)

​

$

4,511

​

Income tax (expense) benefit on net realized gains (losses)

​

$

(65)

​

$

7

​

$

(1,267)

​

Effective tax rate applied

​

​

28.0

%

​

28.0

%

​

28.1

%