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Provision for income taxes: (Tables)
9 Months Ended
Sep. 30, 2023
Income Tax Disclosure [Abstract]  
Provision for Income Taxes

Three months ended

Nine months ended

September 30, 

September 30, 

    

2022

    

2023

    

2022

    

2023

(In thousands)

Expected tax expense, at the U.S. federal statutory
  income tax rate of 21%

$

1,361

$

1,598

$

4,427

$

4,401

State income taxes

 

194

 

230

 

633

 

631

FDII benefit

 

(34)

 

(17)

 

(106)

 

(57)

Other, net

 

7

 

41

 

16

 

83

Total provision for income taxes

$

1,528

$

1,852

$

4,970

$

5,058

Comprehensive provision for income taxes allocable to:

Net income

$

1,528

$

1,852

$

4,970

$

5,058

Other comprehensive income (loss) - marketable securities

8

(23)

Total

$

1,528

$

1,860

$

4,970

$

5,035