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Parent company financial statements - Statement of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Activities                      
Net income $ 45,602 $ (5,599) $ 22,873 $ 745 $ 21,572 $ 23,966 $ 18,688 $ 19,588 $ 63,621 $ 83,814 $ 80,236
Adjustments to reconcile net income to net cash used in operating activities:                      
Loss (gain) on other assets                 90 104 (328)
Stock-based compensation expense                 10,214 7,089 7,207
Net cash (used in) provided by operating activities                 (269,287) 63,905 212,208
Investing Activities                      
Proceeds from the sale of other assets                 0 0 869
Net cash provided by (used in) investing activities                 309,421 (182,913) (586,501)
Financing Activities                      
Accretion of interest rate premium on subordinated debt                 (436) 0 0
Payment of dividends                 (14,264) (10,045) (6,137)
Proceeds from other borrowings                 15,000 0 0
Net proceeds from sale of common stock under employee stock purchase program                 978 804 1,196
Net cash provided by financing activities                 1,045,083 226,333 379,898
Net change in cash and cash equivalents                 1,085,217 107,325 5,605
Cash and cash equivalents at beginning of the period       232,681       125,356 232,681 125,356 119,751
Cash and cash equivalents at end of the period 1,317,898       232,681       1,317,898 232,681 125,356
Supplemental cash flow information:                      
Dividends declared not paid on restricted stock units 238       149       238 149 226
Parent Company                      
Operating Activities                      
Net income                 63,621 83,814 80,236
Adjustments to reconcile net income to net cash used in operating activities:                      
Equity in undistributed income of subsidiaries                 (15,674) (85,750) (83,285)
Gain on investments                 (217) 0 0
Loss (gain) on other assets                 0 16 (297)
Stock-based compensation expense                 10,214 7,089 7,207
(Increase) decrease in other assets                 (9,717) 1,056 (441)
Decrease in other liabilities                 (13,363) (9,711) (7,737)
Net cash (used in) provided by operating activities                 34,864 (3,486) (4,317)
Investing Activities                      
Proceeds from the sale of other assets                 0 0 869
Net cash paid in business combinations (See Note 2)                 (35,505) 0 0
Net cash provided by (used in) investing activities                 (35,505) 0 869
Financing Activities                      
Accretion of interest rate premium on subordinated debt                 (436) 0 0
Payment of dividends                 (14,264) (10,045) (6,137)
Proceeds from other borrowings                 15,000 0 0
Net proceeds from sale of common stock under employee stock purchase program                 978 804 1,196
Net cash provided by financing activities                 1,278 (9,241) (4,941)
Net change in cash and cash equivalents                 637 (12,727) (8,389)
Cash and cash equivalents at beginning of the period       $ 4,673       $ 17,400 4,673 17,400 25,789
Cash and cash equivalents at end of the period 5,310       4,673       5,310 4,673 17,400
Supplemental cash flow information:                      
Dividends declared not paid on restricted stock units $ 238       $ 149       238 149 226
Noncash dividend from Bank                 $ 956 $ 0 $ 572