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SCHEDULE IV - LOANS AND OTHER LENDING INVESTMENTS, Loans and Investments Carrying Amounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of the Company's loans and investments carrying amounts      
Balance at beginning of year $ 3,200,145 $ 2,579,127 $ 1,695,732
Additions during period:      
New loan originations 2,831,822 1,658,732 1,842,974
Loan charge-offs   3,173 20,473
Funding of unfunded loan commitments 65,531 21,027 51,689
Accretion of unearned revenue 12,083 9,278 6,519
Recoveries of reserves   2,527 2,456
Deductions during period:      
Loan payoffs and paydowns (1,753,693) (957,163) (929,796)
Unfunded loan commitments (147,392) (88,617) (77,233)
Use of loan charge-offs   (3,173) (20,473)
Provision for loan losses   (13,986) (2,000)
Unearned revenue and costs (18,536) (10,780) (11,214)
Balance at end of year $ 4,189,960 $ 3,200,145 $ 2,579,127