Fair value of financial instruments - Estimated Fair Values and Carrying Values of Financial Instruments (Details) - USD ($)
$ in Thousands |
Dec. 31, 2020 |
Dec. 31, 2019 |
| Financial assets: |
|
|
| Interest receivable |
$ 43,603
|
$ 17,083
|
| Derivatives |
68,938
|
21,981
|
| Financial liabilities: |
|
|
| Derivatives |
48,242
|
17,933
|
| Level 1 |
|
|
| Financial assets: |
|
|
| Cash and cash equivalents |
1,317,898
|
232,681
|
| Investment securities |
0
|
0
|
| Loans, net |
0
|
0
|
| Loans held for sale |
0
|
0
|
| Interest receivable |
33
|
0
|
| Mortgage servicing rights |
0
|
0
|
| Derivatives |
0
|
0
|
| Financial liabilities: |
|
|
| Deposits, Without stated maturities |
8,020,783
|
3,743,085
|
| Deposits, With stated maturities |
0
|
0
|
| Securities sold under agreement to repurchase and federal funds sold |
32,199
|
23,745
|
| Federal Home Loan Bank advances |
|
0
|
| Subordinated debt |
0
|
0
|
| Other borrowings |
0
|
|
| Interest payable |
327
|
376
|
| Derivatives |
0
|
0
|
| Level 2 |
|
|
| Financial assets: |
|
|
| Cash and cash equivalents |
0
|
0
|
| Investment securities |
1,176,991
|
691,676
|
| Loans, net |
0
|
0
|
| Loans held for sale |
683,770
|
262,518
|
| Interest receivable |
5,254
|
3,282
|
| Mortgage servicing rights |
0
|
0
|
| Derivatives |
68,938
|
21,981
|
| Financial liabilities: |
|
|
| Deposits, Without stated maturities |
0
|
0
|
| Deposits, With stated maturities |
1,446,605
|
1,200,145
|
| Securities sold under agreement to repurchase and federal funds sold |
0
|
0
|
| Federal Home Loan Bank advances |
|
250,213
|
| Subordinated debt |
0
|
29,706
|
| Other borrowings |
16,598
|
|
| Interest payable |
4,210
|
6,089
|
| Derivatives |
48,242
|
17,933
|
| Level 3 |
|
|
| Financial assets: |
|
|
| Cash and cash equivalents |
0
|
0
|
| Investment securities |
0
|
0
|
| Loans, net |
7,058,693
|
4,363,903
|
| Loans held for sale |
215,403
|
0
|
| Interest receivable |
38,316
|
13,801
|
| Mortgage servicing rights |
79,997
|
75,521
|
| Derivatives |
0
|
0
|
| Financial liabilities: |
|
|
| Deposits, Without stated maturities |
0
|
0
|
| Deposits, With stated maturities |
0
|
0
|
| Securities sold under agreement to repurchase and federal funds sold |
0
|
0
|
| Federal Home Loan Bank advances |
|
0
|
| Subordinated debt |
192,149
|
0
|
| Other borrowings |
0
|
|
| Interest payable |
2,235
|
0
|
| Derivatives |
0
|
0
|
| Carrying amount |
|
|
| Financial assets: |
|
|
| Cash and cash equivalents |
1,317,898
|
232,681
|
| Investment securities |
1,176,991
|
691,676
|
| Loans, net |
6,912,570
|
4,378,503
|
| Loans held for sale |
899,173
|
262,518
|
| Interest receivable |
43,603
|
17,083
|
| Mortgage servicing rights |
79,997
|
75,521
|
| Derivatives |
68,938
|
21,981
|
| Financial liabilities: |
|
|
| Deposits, Without stated maturities |
8,020,783
|
3,743,085
|
| Deposits, With stated maturities |
1,437,254
|
1,191,853
|
| Securities sold under agreement to repurchase and federal funds sold |
32,199
|
23,745
|
| Federal Home Loan Bank advances |
|
250,000
|
| Subordinated debt |
189,527
|
30,930
|
| Other borrowings |
16,598
|
|
| Interest payable |
6,772
|
6,465
|
| Derivatives |
48,242
|
17,933
|
| Aggregate fair value |
|
|
| Financial assets: |
|
|
| Cash and cash equivalents |
1,317,898
|
232,681
|
| Investment securities |
1,176,991
|
691,676
|
| Loans, net |
7,058,693
|
4,363,903
|
| Loans held for sale |
899,173
|
262,518
|
| Interest receivable |
43,603
|
17,083
|
| Mortgage servicing rights |
79,997
|
75,521
|
| Derivatives |
68,938
|
21,981
|
| Financial liabilities: |
|
|
| Deposits, Without stated maturities |
8,020,783
|
3,743,085
|
| Deposits, With stated maturities |
1,446,605
|
1,200,145
|
| Securities sold under agreement to repurchase and federal funds sold |
32,199
|
23,745
|
| Federal Home Loan Bank advances |
|
250,213
|
| Subordinated debt |
192,149
|
29,706
|
| Other borrowings |
16,598
|
|
| Interest payable |
6,772
|
6,465
|
| Derivatives |
$ 48,242
|
$ 17,933
|