Income taxes (Tables)
 12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Schedule of Allocation of Federal and State Income Taxes between Current and Deferred Portions
An allocation of federal and state income taxes between current and deferred portions is presented below:
For the Year Ended December 31,
2020 2019 2,018 
Current$44,362 $27,641 $19,259 
Deferred(25,530)(1,916)6,359 
Total$18,832 $25,725 $25,618 
Schedule of Reconciliation of Income Taxes Computed at the United States Federal Statutory Tax Rates to the Provision for Income Taxes
The following table presents a reconciliation of federal income taxes at the statutory federal rate of 21% to the Company's effective tax rates for the year ended December 31, 2020, 2019, and 2018:
For the Year Ended December 31,
2020 2019 2018 
Federal taxes calculated at statutory rate$17,317 21.0 %$23,003 21.0 %$22,230 21.0 %
Increase (decrease) resulting from:
State taxes, net of federal benefit3,197 3.9 %4,792 4.4 %4,666 4.4 %
Expense (benefit) from equity based compensation153 0.2 %(1,353)(1.2)%(870)(0.8)%
Municipal interest income, net of interest disallowance(1,507)(1.8)%(908)(0.8)%(837)(0.8)%
Bank owned life insurance(327)(0.4)%(51)(0.1)%(51)— %
Merger costs289 0.4 %66 0.1 %141 0.1 %
Other(290)(0.4)%176 0.1 %339 0.3 %
Income tax expense, as reported$18,832 22.9 %$25,725 23.5 %$25,618 24.2 %
Schedule of Net Deferred Tax liability
The components of the net deferred tax assets (liabilities) at December 31, 2020 and December 31, 2019, are as follows: 
December 31,December 31
 2020 2019 
Deferred tax assets:  
Allowance for credit losses$48,409 $8,113 
Operating lease liabilities14,496 9,373 
Federal net operating loss1,753 — 
Amortization of core deposit intangibles— 1,386 
Deferred compensation8,872 5,231 
Unrealized loss on debt securities — 54 
Unrealized loss on equity securities — 60 
Unrealized loss on cash flow hedges499 — 
Other19,101 2,388 
Subtotal93,130 26,605 
Deferred tax liabilities:  
FHLB stock dividends$(561)$(550)
Operating leases - right of use assets(13,197)(8,641)
Depreciation(7,491)(5,078)
Amortization of core deposit intangibles(684)— 
Unrealized gain on equity securities(17)— 
Unrealized gain on cash flow hedges— (203)
Unrealized gain on debt securities(13,027)(3,051)
Mortgage servicing rights(20,803)(19,678)
Goodwill(11,301)(8,859)
Other(9,653)(1,035)
Subtotal(76,734)(47,095)
Net deferred tax assets (liabilities)$16,396 $(20,490)